Thanks Peter, After a long process of reducing the code, it came down to (in REPL):
> Array.append (Array.repeat 993 False) (Array.repeat 1 True) TypeError: Cannot read property 'length' of undefined Whereas with 992 instead of 993, it works fine. Should I report this as an issue? -- You received this message because you are subscribed to the Google Groups "Elm Discuss" group. To unsubscribe from this group and stop receiving emails from it, send an email to elm-discuss+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.