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make_test() assigns names to the created items by default and provides additional names argument if user wants to provide names himself/herself.
generate_test_responses() uses items' names (if there are any) to name columns of the returned matrix.
generate_test_responses() converts matrix it returns to numeric one (if only this is possible without loss of information); it also provides additional argument tryConvertToNumeric that allows to bring back its former behavior (i.e. returning a character matrix).
generate_intercepts_sml(), and consequently generate_intercepts() when called with FUNt argument, returns intercepts matrix with additional first columns of zeros to make it compatible with the format that uses function simdata() from mirt package (generate_test_responses() was, and still is, able to deal with providing it intercepts either with or without such additional zeros).
Documentation
Additional section in README.md describing the way function simdata() from package mirt may be used to speed up generation of GPCM responses.