1.2.1 Allowed characters: alphanumeric, non-leading hyphen, underscore, period

I think is an error here
Hi there 🙂

i think we mean non-leading hyphen, non-leading underscore, and non-leading period.

@VincentGe, do you think we need to make this clearer?

If we want to make it clearer, we can make the warning more exact.

1. If there's a character that's not allowed, say "allowed characters: letters, numbers, hyphens, underscores, periods.

2. If there are leading characters that aren't valid, warning should say "ID must begin with a letter or number"

CC: @Sara Does this make sense? We can add to copy audit

I think your 2nd point is a good idea

Yeah more exact messages always help