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@memset on packed unions with over-aligned fields behaves differently under Debug vs Release #17362

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Closed
@memset on packed unions with over-aligned fields behaves differently under Debug vs Release#17362
Labels
bugObserved behavior contradicts documented or intended behavior
Milestone
0.12.0

Description

@kcbanner
kcbanner
opened on Oct 2, 2023

Zig Version

0.12.0-dev.700+376242e58

Steps to Reproduce and Observed Behavior

conststd=@import("std");
consttesting=std.testing;
test"memset packed union" {
constU=packedunion {
a: u32,
b: u8align(8),
};
varu: U=undefined;
@memset(std.mem.asBytes(&u), 0x2a);
trytesting.expectEqual(@as(u32, 0x2a2a2a2a), u.a);
trytesting.expectEqual(@as(u8, 0x2a), u.b);
}
$ zig test memset_packed.zig -O ReleaseFast
Test [1/1] test.memset packed union... expected 707406378, found 00
$ zig test memset_packed.zig
All 1 tests passed.

A few things seem to be required for this to happen:

  • The @memset. Replacing it with var u: U = .{ .a = 0x2a2a2a2a }; resolves the issue.
  • The alignment of the over-aligned field must be greater than the size of any other field. If you change the align(8) to align(4), or if you add a u64 field, the issue is resolved.

Expected Behavior

Consistent behaviour between Debug and Release*.

Metadata

Metadata

Assignees

No one assigned

    Labels

    bugObserved behavior contradicts documented or intended behavior

    Type

    No type

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    No projects

      Milestone

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      None yet

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      No branches or pull requests

      Issue actions

      , 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
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(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
var btn = document.createElement('button');
btn.textContent = 'Copy';
btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';
btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
});
};
codeBlock.parentElement.style.position = 'relative';
codeBlock.parentElement.appendChild(btn);
});
}
addCopyButtons();
// Re-run on dynamic content
var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
`@memset` on packed unions with over-aligned fields behaves differently under Debug vs Release · Issue #17362 · ziglang/zig · GitHub
      Skip to content
      @memset on packed unions with over-aligned fields behaves differently under Debug vs Release #17362
      Closed
      Closed
      @memset on packed unions with over-aligned fields behaves differently under Debug vs Release#17362
      Labels
      bugObserved behavior contradicts documented or intended behavior
      Milestone
      0.12.0
      Description
      @kcbanner
      kcbanner
      opened on Oct 2, 2023
      Zig Version
      0.12.0-dev.700+376242e58
      Steps to Reproduce and Observed Behavior
      conststd=@import("std");
consttesting=std.testing;
test"memset packed union" {
constU=packedunion {
a: u32,
b: u8align(8),
};
varu: U=undefined;
@memset(std.mem.asBytes(&u), 0x2a);
trytesting.expectEqual(@as(u32, 0x2a2a2a2a), u.a);
trytesting.expectEqual(@as(u8, 0x2a), u.b);
}
      $ zig test memset_packed.zig -O ReleaseFast
Test [1/1] test.memset packed union... expected 707406378, found 00
$ zig test memset_packed.zig
All 1 tests passed.

      A few things seem to be required for this to happen:
      • The @memset. Replacing it with var u: U = .{ .a = 0x2a2a2a2a }; resolves the issue.
      • The alignment of the over-aligned field must be greater than the size of any other field. If you change the align(8) to align(4), or if you add a u64 field, the issue is resolved.
      Expected Behavior
      Consistent behaviour between Debug and Release*.
      Metadata
      Metadata
      Assignees
      No one assigned
        Labels
        bugObserved behavior contradicts documented or intended behavior
        Type
        No type
        Projects
        No projects
          Milestone
          Relationships
          None yet
          Development
          No branches or pull requests
          Issue actions
          
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
.markdown-body table th, .markdown-body table td { border-color: #30363d !important; }
.markdown-body img { background: #0d1117; }
.markdown-body blockquote { border-left-color: #8b949e; }
.markdown-body hr { border-color: #30363d; }
';
document.head.appendChild(style);
})();
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
`@memset` on packed unions with over-aligned fields behaves differently under Debug vs Release · Issue #17362 · ziglang/zig · GitHub
          Skip to content
          @memset on packed unions with over-aligned fields behaves differently under Debug vs Release #17362
          Closed
          Closed
          @memset on packed unions with over-aligned fields behaves differently under Debug vs Release#17362
          Labels
          bugObserved behavior contradicts documented or intended behavior
          Milestone
          0.12.0
          Description
          @kcbanner
          kcbanner
          opened on Oct 2, 2023
          Zig Version
          0.12.0-dev.700+376242e58
          Steps to Reproduce and Observed Behavior
          conststd=@import("std");
consttesting=std.testing;
test"memset packed union" {
constU=packedunion {
a: u32,
b: u8align(8),
};
varu: U=undefined;
@memset(std.mem.asBytes(&u), 0x2a);
trytesting.expectEqual(@as(u32, 0x2a2a2a2a), u.a);
trytesting.expectEqual(@as(u8, 0x2a), u.b);
}
          $ zig test memset_packed.zig -O ReleaseFast
Test [1/1] test.memset packed union... expected 707406378, found 00
$ zig test memset_packed.zig
All 1 tests passed.

          A few things seem to be required for this to happen:
          • The @memset. Replacing it with var u: U = .{ .a = 0x2a2a2a2a }; resolves the issue.
          • The alignment of the over-aligned field must be greater than the size of any other field. If you change the align(8) to align(4), or if you add a u64 field, the issue is resolved.
          Expected Behavior
          Consistent behaviour between Debug and Release*.
          Metadata
          Metadata
          Assignees
          No one assigned
            Labels
            bugObserved behavior contradicts documented or intended behavior
            Type
            No type
            Projects
            No projects
              Milestone
              Relationships
              None yet
              Development
              No branches or pull requests
              Issue actions
              
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
if (q) {
terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
}
}
if (terms.length === 0) return;
var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
document.head.appendChild(style);
function highlight(node) {
if (node.nodeType === 3) { // text node
var text = node.textContent;
var found = false;
terms.forEach(function(term) {
var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi');
if (regex.test(text)) {
found = true;
var frag = document.createDocumentFragment();
var parts = text.split(regex);
parts.forEach(function(part, i) {
if (i % 2 === 0) {
frag.appendChild(document.createTextNode(part));
} else {
var span = document.createElement('span');
span.className = 'userscript-highlight';
span.textContent = part;
frag.appendChild(span);
}
});
node.parentNode.replaceChild(frag, node);
}
});
} else if (node.nodeType === 1 && node.childNodes) { // element
var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
if (!skipTags.includes(node.tagName)) {
Array.from(node.childNodes).forEach(highlight);
}
}
}
highlight(document.body);
// Re-highlight on dynamic content
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1 || node.nodeType === 3) highlight(node);
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
`@memset` on packed unions with over-aligned fields behaves differently under Debug vs Release · Issue #17362 · ziglang/zig · GitHub
              Skip to content
              @memset on packed unions with over-aligned fields behaves differently under Debug vs Release #17362
              Closed
              Closed
              @memset on packed unions with over-aligned fields behaves differently under Debug vs Release#17362
              Labels
              bugObserved behavior contradicts documented or intended behavior
              Milestone
              0.12.0
              Description
              @kcbanner
              kcbanner
              opened on Oct 2, 2023
              Zig Version
              0.12.0-dev.700+376242e58
              Steps to Reproduce and Observed Behavior
              conststd=@import("std");
consttesting=std.testing;
test"memset packed union" {
constU=packedunion {
a: u32,
b: u8align(8),
};
varu: U=undefined;
@memset(std.mem.asBytes(&u), 0x2a);
trytesting.expectEqual(@as(u32, 0x2a2a2a2a), u.a);
trytesting.expectEqual(@as(u8, 0x2a), u.b);
}
              $ zig test memset_packed.zig -O ReleaseFast
Test [1/1] test.memset packed union... expected 707406378, found 00
$ zig test memset_packed.zig
All 1 tests passed.

              A few things seem to be required for this to happen:
              • The @memset. Replacing it with var u: U = .{ .a = 0x2a2a2a2a }; resolves the issue.
              • The alignment of the over-aligned field must be greater than the size of any other field. If you change the align(8) to align(4), or if you add a u64 field, the issue is resolved.
              Expected Behavior
              Consistent behaviour between Debug and Release*.
              Metadata
              Metadata
              Assignees
              No one assigned
                Labels
                bugObserved behavior contradicts documented or intended behavior
                Type
                No type
                Projects
                No projects
                  Milestone
                  Relationships
                  None yet
                  Development
                  No branches or pull requests
                  Issue actions
                  
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
`@memset` on packed unions with over-aligned fields behaves differently under Debug vs Release · Issue #17362 · ziglang/zig · GitHub
                  Skip to content
                  @memset on packed unions with over-aligned fields behaves differently under Debug vs Release #17362
                  Closed
                  Closed
                  @memset on packed unions with over-aligned fields behaves differently under Debug vs Release#17362
                  Labels
                  bugObserved behavior contradicts documented or intended behavior
                  Milestone
                  0.12.0
                  Description
                  @kcbanner
                  kcbanner
                  opened on Oct 2, 2023
                  Zig Version
                  0.12.0-dev.700+376242e58
                  Steps to Reproduce and Observed Behavior
                  conststd=@import("std");
consttesting=std.testing;
test"memset packed union" {
constU=packedunion {
a: u32,
b: u8align(8),
};
varu: U=undefined;
@memset(std.mem.asBytes(&u), 0x2a);
trytesting.expectEqual(@as(u32, 0x2a2a2a2a), u.a);
trytesting.expectEqual(@as(u8, 0x2a), u.b);
}
                  $ zig test memset_packed.zig -O ReleaseFast
Test [1/1] test.memset packed union... expected 707406378, found 00
$ zig test memset_packed.zig
All 1 tests passed.

                  A few things seem to be required for this to happen:
                  • The @memset. Replacing it with var u: U = .{ .a = 0x2a2a2a2a }; resolves the issue.
                  • The alignment of the over-aligned field must be greater than the size of any other field. If you change the align(8) to align(4), or if you add a u64 field, the issue is resolved.
                  Expected Behavior
                  Consistent behaviour between Debug and Release*.
                  Metadata
                  Metadata
                  Assignees
                  No one assigned
                    Labels
                    bugObserved behavior contradicts documented or intended behavior
                    Type
                    No type
                    Projects
                    No projects
                      Milestone
                      Relationships
                      None yet
                      Development
                      No branches or pull requests
                      Issue actions
                      
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
`@memset` on packed unions with over-aligned fields behaves differently under Debug vs Release · Issue #17362 · ziglang/zig · GitHub
                      Skip to content
                      @memset on packed unions with over-aligned fields behaves differently under Debug vs Release #17362
                      Closed
                      Closed
                      @memset on packed unions with over-aligned fields behaves differently under Debug vs Release#17362
                      Labels
                      bugObserved behavior contradicts documented or intended behavior
                      Milestone
                      0.12.0
                      Description
                      @kcbanner
                      kcbanner
                      opened on Oct 2, 2023
                      Zig Version
                      0.12.0-dev.700+376242e58
                      Steps to Reproduce and Observed Behavior
                      conststd=@import("std");
consttesting=std.testing;
test"memset packed union" {
constU=packedunion {
a: u32,
b: u8align(8),
};
varu: U=undefined;
@memset(std.mem.asBytes(&u), 0x2a);
trytesting.expectEqual(@as(u32, 0x2a2a2a2a), u.a);
trytesting.expectEqual(@as(u8, 0x2a), u.b);
}
                      $ zig test memset_packed.zig -O ReleaseFast
Test [1/1] test.memset packed union... expected 707406378, found 00
$ zig test memset_packed.zig
All 1 tests passed.

                      A few things seem to be required for this to happen:
                      • The @memset. Replacing it with var u: U = .{ .a = 0x2a2a2a2a }; resolves the issue.
                      • The alignment of the over-aligned field must be greater than the size of any other field. If you change the align(8) to align(4), or if you add a u64 field, the issue is resolved.
                      Expected Behavior
                      Consistent behaviour between Debug and Release*.
                      Metadata
                      Metadata
                      Assignees
                      No one assigned
                        Labels
                        bugObserved behavior contradicts documented or intended behavior
                        Type
                        No type
                        Projects
                        No projects
                          Milestone
                          Relationships
                          None yet
                          Development
                          No branches or pull requests
                          Issue actions
                          
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
`@memset` on packed unions with over-aligned fields behaves differently under Debug vs Release · Issue #17362 · ziglang/zig · GitHub
                          Skip to content
                          @memset on packed unions with over-aligned fields behaves differently under Debug vs Release #17362
                          Closed
                          Closed
                          @memset on packed unions with over-aligned fields behaves differently under Debug vs Release#17362
                          Labels
                          bugObserved behavior contradicts documented or intended behavior
                          Milestone
                          0.12.0
                          Description
                          @kcbanner
                          kcbanner
                          opened on Oct 2, 2023
                          Zig Version
                          0.12.0-dev.700+376242e58
                          Steps to Reproduce and Observed Behavior
                          conststd=@import("std");
consttesting=std.testing;
test"memset packed union" {
constU=packedunion {
a: u32,
b: u8align(8),
};
varu: U=undefined;
@memset(std.mem.asBytes(&u), 0x2a);
trytesting.expectEqual(@as(u32, 0x2a2a2a2a), u.a);
trytesting.expectEqual(@as(u8, 0x2a), u.b);
}
                          $ zig test memset_packed.zig -O ReleaseFast
Test [1/1] test.memset packed union... expected 707406378, found 00
$ zig test memset_packed.zig
All 1 tests passed.

                          A few things seem to be required for this to happen:
                          • The @memset. Replacing it with var u: U = .{ .a = 0x2a2a2a2a }; resolves the issue.
                          • The alignment of the over-aligned field must be greater than the size of any other field. If you change the align(8) to align(4), or if you add a u64 field, the issue is resolved.
                          Expected Behavior
                          Consistent behaviour between Debug and Release*.
                          Metadata
                          Metadata
                          Assignees
                          No one assigned
                            Labels
                            bugObserved behavior contradicts documented or intended behavior
                            Type
                            No type
                            Projects
                            No projects
                              Milestone
                              Relationships
                              None yet
                              Development
                              No branches or pull requests
                              Issue actions
                              
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();
`@memset` on packed unions with over-aligned fields behaves differently under Debug vs Release · Issue #17362 · ziglang/zig · GitHub
                              Skip to content
                              @memset on packed unions with over-aligned fields behaves differently under Debug vs Release #17362
                              Closed
                              Closed
                              @memset on packed unions with over-aligned fields behaves differently under Debug vs Release#17362
                              Labels
                              bugObserved behavior contradicts documented or intended behavior
                              Milestone
                              0.12.0
                              Description
                              @kcbanner
                              kcbanner
                              opened on Oct 2, 2023
                              Zig Version
                              0.12.0-dev.700+376242e58
                              Steps to Reproduce and Observed Behavior
                              conststd=@import("std");
consttesting=std.testing;
test"memset packed union" {
constU=packedunion {
a: u32,
b: u8align(8),
};
varu: U=undefined;
@memset(std.mem.asBytes(&u), 0x2a);
trytesting.expectEqual(@as(u32, 0x2a2a2a2a), u.a);
trytesting.expectEqual(@as(u8, 0x2a), u.b);
}
                              $ zig test memset_packed.zig -O ReleaseFast
Test [1/1] test.memset packed union... expected 707406378, found 00
$ zig test memset_packed.zig
All 1 tests passed.

                              A few things seem to be required for this to happen:
                              • The @memset. Replacing it with var u: U = .{ .a = 0x2a2a2a2a }; resolves the issue.
                              • The alignment of the over-aligned field must be greater than the size of any other field. If you change the align(8) to align(4), or if you add a u64 field, the issue is resolved.
                              Expected Behavior
                              Consistent behaviour between Debug and Release*.
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                                bugObserved behavior contradicts documented or intended behavior
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