From type/Metamodel/Versioning

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method auth($obj)

Returns the author of the metaobject, if any, otherwise returns an empty string.

From type/Systemic

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Instance method returning the "auth" (as in "author" or "authority") of the object. Returns "unknown" if the "auth" could not be established.

From type/CompUnit

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method auth(--> Str:D)

Returns the authority information with which the CompUnit object was created (if any).