Each call to JsonStreamReader::read() and JsonStreamWriter::write() was executing require $path, which re-evaluated the generated PHP file and created new closures.

And these closures contain circular references (&$providers) that weren't being garbage collected, causing memory to grow unbounded.

The fix caches the closure returned by require $path so it's reused on subsequent calls with the same type.

• Before: Memory grows from 12MB to 118MB+ after ~7000 iterations.
• After: Memory stays stable at ~18MB regardless of iterations.