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Which issue does this PR close?
Related #4
Rationale for this change
can't run in
python3.6
What changes are included in this PR?
fix bug
typing.Union
should beUnion[float, Decimal]
instead ofUnion[float | Decimal]
ci
use tox to run ci with different Python versions
Are these changes tested?
Yes
Are there any user-facing changes?
No