Library Version 12.1.6.0

Comparison Function Signature Change
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## Comparison Function Signature Change

A new parameter has been added to the comparison callback set by the following methods:

- DB->set_bt_compare()
- DB->set_dup_compare()
- DB->set_h_compare()

The new parameter is the `locp` parameter, and it is the last parameter required in the callback's signature. It is intended for internal use only. In customer code, the parameter must be set to `NULL`.

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