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Note: the intent of the original modification (and these updates) is not to change how new_id() functions. What has been done is to pull out the code which calculates a new name for an ID in the case of duplicate, as would happen when you copy any datablock, into a separate function. This code is necessary in the new Python Library module, since it otherwise is extremely difficult to locate a new datablock appended from a library. new_id() calls this separate function to generate a name for the new ID if necessary, just as it previously did. To make the purpose of this new function clearer, I renamed it check_for_dupid() and added more extensive comments. I repeat, it's not meant to be a substitute for new_id().