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Document the ASCII case folding requirement #95

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Merged
GrahamCampbell merged 1 commit into from
Jul 11, 2026
Merged

Document the ASCII case folding requirement #95

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4 changes: 4 additions & 0 deletions AGENTS.md
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Expand Up @@ -26,6 +26,10 @@
where they are accepted and we need to cast to a string, we should branch on
`\is_finite($value)`, using `(string) $value` for the finite case and
`\is_nan($value) ? 'NAN' : ($value > 0 ? 'INF' : '-INF')` otherwise.
- Never call `strtolower()`, `strtoupper()`, `strcasecmp()`, `stripos()`, or
other locale-sensitive case functions; use the locale-independent
`GuzzleHttp\Psr7\Utils::asciiToLower()`, `asciiToUpper()`,
`caselessEquals()`, and `caselessContains()` helpers instead.
- Changes in behavior need a `CHANGELOG.md` entry in the unreleased section of
the target branch and an `UPGRADING.md` note when the behavior differs between
major versions.
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