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Make base objects hashable, use it for equality check, and include srid #8

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Make base objects hashable, use it for equality check, and include srid #8

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yohanboniface
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I wonder if we should make sure neither self.coords nor self.srid is changed during the lifetime of a geometry, given hash depends on them, and a hash of an instance must never change.

@yohanboniface
Make base objects hashable, use it for equality check, including srid
1dd374b 
srid defaults to 0, as ST_SRID does:

```
 st_srid
---------
       0
(1 row)
```
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