Make base objects hashable, use it for equality check, and include srid #8
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srid defaults to 0, as ST_SRID does:
```
st_srid
---------
0
(1 row)
```
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I wonder if we should make sure neither
self.coordsnorself.sridis changed during the lifetime of a geometry, given hash depends on them, and a hash of an instance must never change.