[PurHur]

Summary

• str_contains(), str_starts_with(), and str_ends_with() now reject Stringable object operands with TypeError (PHP 8+ typed string parameters), matching Zend/php-src.
• VM uses coerceStringBuiltinArgNoObject; JIT uses JitStringBuiltinArg::lower instead of lowerCoercible.

Closes #14660

php-src reference

ext/standard/string.c — PHP_FUNCTION(str_contains) et al. (Z_PARAM_STR without object coerce path)

Verification

php test/repro/maintainer_gap_str_contains_stringable_typeerror.php           # ok
php bin/vm.php test/repro/maintainer_gap_str_contains_stringable_typeerror.php # ok
php bin/vm.php test/compliance/cases/stdlib/str_contains_object_type_error.phpt
# str_contains: str_contains(): Argument #1 ($haystack) must be of type string, C given
# str_starts_with: str_starts_with(): Argument #1 ($haystack) must be of type string, C given
# str_ends_with: str_ends_with(): Argument #1 ($haystack) must be of type string, C given

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