I think I read about a tool for the Acorn BBC micros which you could apply to your program to remove unnecessary spaces etc. in the tokenised form and shave off

I think I read about a tool for the Acorn BBC micros which you could apply to your program to remove unnecessary spaces etc. in the tokenised form and shave off a few bytes. This had the side-effect that you could still display and (presumably with a bit more mental effort, read) the program listing fine, but re-entering a line as shown in that listing would fail because the computer depended on the spaces to do the parsing, even if they were redundant after the tokenisation happened.