Open a file in a Property

Is there a way to open a file as a part of a property check? I'm write a parser library, and one behavior I need to test is the a source string is parsed the same regardless of how it is chunked. I would like to load the file into memory once and then rechunk it on each run of the test. I cannot see how to do this. If I do IO in `Property`, I think the `IO` will be repeated every time.

Start by reading the Property API and its handling of IO, focusing on the issue's concern that IO may repeat for every property check. No repository file or test is named; done means establishing a supported way to load a file once and reuse rechunked input across runs.

Written by the indexing model from the issue text.