Fix ValidIdentifierHelper.IsValidIdentifier accepting @ as valid#2040

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SimonCropp wants to merge 2 commits intodotnet:mainfrom

SimonCropp:Fix-ValidIdentifierHelper.IsValidIdentifier-accepting-@-as-valid

Commits on Mar 22, 2026

Fix ValidIdentifierHelper.IsValidIdentifier accepting "@" as valid
SimonCropp
committed
if the value is just "@" then value.Length == 1, no need for the Substring at all.
SimonCropp
committed