fix(php-shim): use PhpMixed::to_bool() for PHP truthy casts

Several call sites coerced PhpMixed to bool via `.as_bool()` (which
only matches a literal Bool variant) where the corresponding PHP code
does a plain `(bool)` cast or truthy check (isset()/array_key_exists()
+ implicit bool conversion). This silently dropped truthy non-bool
values (e.g. String("true"), String("1"), Int(1)) to their unwrap_or
default instead of PHP's actual truthy result. Switched these sites to
PhpMixed::to_bool(), which implements PHP's full truthy-cast rules.

1 files changed, 2 insertions, 2 deletions

diff --git a/crates/shirabe/src/package/loader/root_package_loader.rs b/crates/shirabe/src/package/loader/root_package_loader.rs
index 95cd1225..284bb175 100644
--- a/crates/shirabe/src/package/loader/root_package_loader.rs
+++ b/crates/shirabe/src/package/loader/root_package_loader.rs
@@ -229,8 +229,8 @@ impl RootPackageLoader {
         real_package.set_stability_flags(stability_flags);
         real_package.set_references(references);
 
-        if let Some(prefer_stable) = config.get("prefer-stable").and_then(|v| v.as_bool()) {
-            real_package.set_prefer_stable(prefer_stable);
+        if let Some(prefer_stable) = config.get("prefer-stable").and_then(|v| v.as_opt()) {
+            real_package.set_prefer_stable(prefer_stable.to_bool());
         }
 
         if let Some(pkg_config) = config.get("config").and_then(|v| v.as_array()) {