PHP 8.5 INTERNALS UPGRADE NOTES

1. Internal API changes

2. Build system changes

3. Module changes

4. OpCode changes

5. SAPI changes

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1. Internal API changes
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2. Build system changes
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3. Module changes
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- ext/libxml
  . The refcount APIs now return an `unsigned int` instead of an `int`.

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4. OpCode changes
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5. SAPI changes
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