template spec version hard-coded and breaks with edge

[martypdx]

This breaks with edge.

!(parsed.v >= 1) seems to work. But not entirely sure what best course is...

[Rich-Harris]

Oops. Good point. Maybe the best course is to downgrade it from a fatal error to a loud warning?

[mpowell-atomic]

Any motion on this, it's still an issue with the current edge version? Thanks!