https://en.wikipedia.org/wiki/LALR_parser - as far as I understand, LALR(1) is a simplified version of LR(1), aiming to achieve a greater parsing performance at the expense of reduced power. So, IIUC, LALR(1) is a strict subset of LR(1): each grammar parseable by LALR(1) is parseable by LR(1), but not the other way around.
I'm surprised because it seems I've managed to create a grammar for which this tool: https://mdaines.github.io/grammophone/ says it is not LR(1) but is LALR(1) .
Therefore: Am I mistaken in my belief that LALR(1) is a strict subset of LR(1)? Or is Grammophone buggy and unreliable?