v1.5.0

Fix #200: Segmentation fault merging keys of maps containing maps

In `ds_htable_put` when found is true, but value is NULL, the old
bucket->value is not cleared out, resulting in a stale

Fix #200: Segmentation fault merging keys of maps containing maps

In `ds_htable_put` when found is true, but value is NULL, the old
bucket->value is not cleared out, resulting in a stale value being
stored. This means that further operations will keep destroying the
stale zval, resulting in a refcount underflow.

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First steps to PHP 8 support

Fixed buffer outflow during deserialization of map objects

Fix pair reflection bugs by avoiding __get and __set

Make sure -0.0 and 0.0 generate the same hash

Use spl_object_id instead of spl_object_hash to provide object hash values

This provides a significant speed boost on the Set::add benchmark (for 2**20 values the time went from 240ms to 100

Use spl_object_id instead of spl_object_hash to provide object hash values

This provides a significant speed boost on the Set::add benchmark (for 2**20 values the time went from 240ms to 100ms on my machine)

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Improve float/double hash values

Right now the hash value for floats is their integer component. Instead, use dark magic to map the bits to an int.

Move next power of 2 to common

Replace allocation macros with safer functions

Reset the lookup table so that the htable can be used after it is cleared

htable should truncate when size is also equal to a quarter

Adjustment to how htable lookup by position works

Small refactor and adjustment to htable find by position

Rename htable extended initialiser

Remove unserialize string termination check

Refactor of htable capacity increase

Minor htable auto truncate refactor

Fix htable truncating capacity below minimum

Another direct key cast from bucket

Casting bucket to key directly in compare func

Fix htable put distinct rehash

Fix memory leaks, minor refactoring

Fix divide by zero errors in deque and vector rotate

Partial refactor to fix wall