@specifiedBy built-in directive #9
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		Delete Branch "%!s()"
	 
	Deleting a branch is permanent. Although the deleted branch may continue to exist for a short time before it actually gets removed, it CANNOT be undone in most cases. Continue?
2021 edition has a new built-in directive,
@specifiedBy(url: String!), with one string argument, specifying an URL to a human-readable specification.