ptondereau / ext-php-rs / 24394367537

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feat: use static function pointers for class properties instead of heap allocations

Previously, each PHP class property required boxing closures (Box<dyn Fn>)
and building a HashMap at runtime. This happened once per class but was
unnecessary since all property metadata is known at compile time.

Now the macros generate plain function pointers and static arrays that
live entirely in read-only memory. Property lookup uses a simple linear
scan over two small slices (field props, then getter/setter props),
which is faster than hashing for the typical class size (< 20 properties).

This removes the Property enum, Prop trait, and PropertyInfo struct,
replacing them with a single PropertyDescriptor<T> that holds:
- fn(&T, &mut Zval) -> PhpResult for getters
- fn(&mut T, &Zval) -> PhpResult for setters
- visibility flags, type info, docs

Also adds callgrind-based property read/write benchmarks.

Closes #70

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