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Nothing in the standard library documentation for the string module suggests that the value associated with any key in the mapping parameter(or kwds) to Template.substitute and Template.safe_substitute should be a string. In fact any object can be used, for example
Template("$number is a number.").substitute({"number": 1})
The above code sample currently causes an error message like this:
error: Dict entry 0 has incompatible type "str": "int"; expected "str": "str"
which obviously shouldn't be emitted. Also a similar logic is already in place for methods in the Formatter class. However as I saw the notice about loose types above the Formatter class, I opted to use `object` instead of `Any` as the implementation inside the affected functions just uses the built-in str function on values inside mappings.