st: Function that returns variable type (string, etc.)?

[Rachel <academicgirl@gmail.com>]

I'm looking for a function that returns the type of a given variable.
Specifically, I'd like to know if each variable in a list is a string
or not.

This seems fairly obvious, but I couldn't find it in the documentation
under "Format" or any of the related entries.

Thanks,
Rachel
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