On UEFI Unable to use reader and writer interface for File without `@constcast`

[kouosi]

Zig Version

0.15.0-dev.151+6e8493daa

Steps to Reproduce and Observed Behavior

When Directly using reader the compiler gives

test.zig:15:33: error: expected type '*os.uefi.protocol.file.File', found '*const os.uefi.protocol.file.File' 
 const reader = test_file.reader(); 
 ~~~~~~~~~^~~~~~~ 
soda.zig:15:33: note: cast discards const qualifier 
/path/lib/std/os/uefi/protocol/file.zig:35:25: note: parameter type declared here 
 pub fn reader(self: *File) Reader { 

var file: *const uefi.protocol.File = undefined;

pub fn main() noreturn {
 var loaded_image: *uefi.protocol.LoadedImage = undefined;
 var simple_fs: *uefi.protocol.SimpleFileSystem = undefined;
 var root_fs: *const uefi.protocol.File = undefined;
 var test_file: *const uefi.protocol.File = undefined;

 if (uefi.system_table.boot_services) |boot_services| {
 _ = boot_services.handleProtocol(uefi.handle, &uefi.protocol.LoadedImage.guid, @ptrCast(&loaded_image));
 _ = boot_services.handleProtocol(loaded_image.device_handle.?, &uefi.protocol.SimpleFileSystem.guid, @ptrCast(&simple_fs));
 _ = simple_fs.openVolume(&root_fs);
 const file_name = &[_:0] u16{'t', 'e','s', 't', '.', 't', 'x', 't'}; // test.txt
 _ = root_fs.open(&test_file, file_name, uefi.protocol.File.efi_file_mode_read, uefi.protocol.File.efi_file_read_only);
var file: *const uefi.protocol.File = undefined;

pub fn main() noreturn {
 var loaded_image: *uefi.protocol.LoadedImage = undefined;
 var simple_fs: *uefi.protocol.SimpleFileSystem = undefined;
 var root_fs: *const uefi.protocol.File = undefined;
 var test_file: *const uefi.protocol.File = undefined;

 if (uefi.system_table.boot_services) |boot_services| {
 _ = boot_services.handleProtocol(uefi.handle, &uefi.protocol.LoadedImage.guid, @ptrCast(&loaded_image));
 _ = boot_services.handleProtocol(loaded_image.device_handle.?, &uefi.protocol.SimpleFileSystem.guid, @ptrCast(&simple_fs));
 _ = simple_fs.openVolume(&root_fs);
 const file_name = &[_:0] u16{'t', 'e','s', 't', '.', 't', 'x', 't'}; // test.txt
 _ = root_fs.open(&test_file, file_name, uefi.protocol.File.efi_file_mode_read, uefi.protocol.File.efi_file_read_only);
 const reader = test_file.reader();
 // const reader = @constCast(test_file).reader(); // but this works
 _ = reader;
 }
 while (true) {}
}

const uefi = std.os.uefi;
const std = @import("std");

Expected Behavior

Should work with

const reader = test_file.reader();