Fix `topoint` to handle latitude with floating-point errors

[eliascarv]

closes #105

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.73%. Comparing base (e1f34e8) to head (9b36f78). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #106 +/- ## ======================================= Coverage 94.73% 94.73% ======================================= Files 17 17 Lines 1082 1082 ======================================= Hits 1025 1025 Misses 57 57 ```

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