Change default value $strict in Inflector::toSnakeCase() to false

[vjik]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	✔️

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (f7c9db9) to head (e05a7fe).

Additional details and impacted files

@@ Coverage Diff @@## master #165 +/- ##
===========================================
Coverage 100.00% 100.00% Complexity 171 171 ===========================================
Files 7 7 Lines 476 476 ===========================================
Hits 476 476 

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[Copilot]

Pull request overview

This PR changes the default value of the $strict parameter in Yiisoft\Strings\Inflector::toSnakeCase() from true to false (a BC break), and updates the surrounding release documentation and tests to reflect the new default behavior.

Changes:

• Update Inflector::toSnakeCase() signature and docblock to default $strict to false.
• Adjust InflectorTest expectations/data to cover the new default and explicitly set strict: true where the old behavior is required.
• Bump the changelog “under development” section to 3.0.0 and add an upgrade note describing the BC break.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
src/Inflector.php	Changes the default $strict value in toSnakeCase() and updates PHPDoc accordingly.
tests/InflectorTest.php	Updates test data to align with the new default behavior and preserves old behavior via strict: true.
UPGRADE.md	Adds an upgrade note describing how to retain prior behavior when upgrading to 3.x.
CHANGELOG.md	Moves “under development” to 3.0.0 and records the BC change.

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[samdark]

UPGRADE.md has wrong example. Check copilot comments.