Update to twiddles 0.6.1

[codecov-commenter]

Codecov Report

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

Comparison is base (1674269) 84.33% compared to head (6fdbe6e) 84.33%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## series/0.6.x #1015 +/- ## ============================================= Coverage 84.33% 84.33% ============================================= Files 126 126 Lines 1736 1736 Branches 197 197 ============================================= Hits 1464 1464 Misses 272 272 ```

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