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git diff upstream/master | flake8 --diff
Because dtype coercion affects to lots of functions, would like to fix in the following steps. The behavior which looks incorrect are commented with
TODO_GH12747
1(this PR) Add numeric related tests to clarify the current behaviour (and future change)
2. Fix numeric coercion.
3. Add datetime-like tests.
4. Fix datetime-like coercion.