h3_to_parent at resolution 0 labels it as direct parent

[alpha-beta-soup]

h3_to_parent at resolution 0 calculates correctly, but returns a column called h3_parent, rather than h3_00 (or perhaps h3_0?) as expected based on the pattern for other resolutions.

I don't think there's anything unexpected about calculating the 0-level parent (I use it for partitioning; a higher resolution is used for my actual information). Rather it's just that this line checks for implicit False, not a strict check for None.

column = self._format_resolution(resolution) if resolution else "h3_parent"

Should be:

column = self._format_resolution(resolution) if resolution != None else "h3_parent"

>>> 'a' if 0 != None else 'b'
'a'
>>> 'a' if 0 else 'b'
'b'

The actual result is correct, it is a level-0 cell.

[DahnJ]

Hi @alpha-beta-soup, thank you for the bug report and for finding the solution! I implemented the change in #21