#233: Replaced PackedByteArray with PackedInt32Array #250
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The #233 was caused by the fact that PackedByteArray was used to store regions' indices.
The code incremented actual index by 1.
Hence the 255th region had index 256 in the _region_map. However 256 overlows 8-bit, hence the bug occured.
I replaced PackedByteArray with PackedInt32Array, which solved the issue.
Fixes #233