M4a comment field: limited no of characters?

Whenever i copy-paste a comment on a .m4a file's tag comment field, the program cuts the number of characters to a set amount and displays "..." after the last word.
Why do i get this and is it fixable? Editing the tag of the same file (any field) through windows explorer results in an "unspecified error" message

It's the single most annoying thing about the M4A spec (and Mp3Tag's implementation of it). All tag fields require a limit of 255 characters else will be truncated.

foobar2000 bypasses this limit, thankfully, for those who don't use iTunes or any other device where longer fields may cause issues.

It's frustrating for those who keep tracklists of long mixes/recordings in the Comments tag, or any long description.