Different behavior for SingleKey and DottedKey with single value #430

I am building a tomlkit document and want to generate keys dynamically. Sometimes the lengths of my key specifications are only 1 long, but tomlkit still generates a DottedKey out of it. The documentation of tomlkit.key is very clear about it: specifying a list will return a DottedKey.

But I think it would be a nice addition if the function checks the length of the list before making that decision.

A minimal example of what goes wrong now:

import tomlkit

doc = tomlkit.document()
doc.append(tomlkit.key("my_key"), "value")
key_in_doc = "my_key" in doc # returns True

doc2 = tomlkit.document()
doc2.append(tomlkit.key(["my_key"]), "value")
key_in_doc2 = "my_key" in doc2 # returns False

assert key_in_doc == key_in_doc2 # unfortunately not

The in functionality doesn't seem to recognize the DottedKey as equal to a single str.

I was able to do a workaround in the code now by:

doc = tomlkit.document()
if len(key_spec) == 1:
    doc.append(tomlkit.key(key_spec[0]), "value")
else:
    doc.append(tomlkit.key(key_spec, "value")

Or in whatever way you want to implement it. At least, I really needed to unwrap the key_spec in order to make the in function work correctly.

Tested with tomlkit 0.13.3