Word that means "something that can be abbreviated"

The two answers that spring to mind are “abbreviable” and “abbreviatable,” however neither of them feel correct. Searching the Internet has yielded no conclusive results – dictionaries seem to contain no entries for this, and people seem to restructure their sentence to avoid this problem. Trying to find usage of the two candidates I thought of is just as inconclusive, with no definitions or accepted standard.

Is there a correct answer? A single word is preferable.

An example in English would be “The phrase ‘I don’t know’ is abbreviable to ‘IDK’.”

The original intended usage is for a Python project. Using more than one word for this would be too verbose.

class AbbreviatableIdentifier:
    ...