python -> YAML: the strings yes and no get quotation marks (but shouldn't)

Is there a reason why yaml adds single quotation marks around the words yes and no when I create a YAML file from a python dict?

MWE:

import yaml def yes_or_no( word: str, ) -> dict: thestring = { "theword": word, } return thestring thedict = yes_or_no("yes") # Writing nested data to a YAML file with open("output.yaml", "w") as file: yaml.dump(thedict, file)

This returns the following YAML file:

theword: 'yes'

When I call yes_or_no("what"), the YAML file is

theword: what

without single quotation marks around the word what. How can I avoid the single quotation marks around the words yes and no?

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