It's not clear what "almost works" means. Are you expecting a filename or a filehandle from the param() call? (My guess is filename, based on fuzzy recollection). I'm also guessing that you're getting glob operation instead of a filehandle read, but that's a big shot in the dark.
If declaring @buffer as a lexical before the block fails, either your installation of Perl is completely broken, or the code inside the block is completely broken. I'd lean towards the latter.
Print the contents of $buffer before you transliterate or split, and see if it's what you expect. My guess is that it isn't.
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