[PurHur]

Summary

• VM strlen() now uses VmString::coerceStringBuiltinArg (same as trim() family) so Stringable objects return strlen((string)$obj).
• JIT JitStrlen coerces objects via JitNativeString / JitStringBuiltinArg::lowerCoercible when caller is not strict.

php-src reference

• ext/standard/string.c — _php_string_arg object coercion

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php -r "class C implements Stringable { public function __toString(): string { return \"obj\"; } } echo strlen(new C()), \"\n\";"
php bin/vm.php -r "class C implements Stringable { public function __toString(): string { return \"obj\"; } } echo strlen(new C()), \"\n\";"
php bin/jit.php -r "class C implements Stringable { public function __toString(): string { return \"obj\"; } } echo strlen(new C()), \"\n\";"
'
# Expected: 3 on all three

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit --filter strlen_stringable'
# OK (1 test)

Closes #13468

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