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PHP 8.1 INTERNALS UPGRADE NOTES

1. Internal API changes

2. Build system changes

3. Module changes
  a. ext/hash

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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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  a. ext/hash
    - The init signatures are extended with an additional `HashTable*`
      argument. The passed HT is to contain the algorithm specific
      configuration. If the an algorithm doesn't make use of any
      additional configuration, the argument is to be marked with
      ZEND_ATTRIBUTE_UNUSED.