The GRPlatform>>fileStreamOn:do:binary: offers read access to files. There is not GRPlatform>>writeFileStreamOn:do:binary: method to stream contents to a file. Instead, users of Grease must use GRPlatform>>write:toFile:inFolder.

This is specifically of interest to #103, where it was also raised we are lagging behind the FileStream deprecation in Pharo.