Fixed Metadata Value
A FixedMetadataValue is getClassById special case metadata item that contains the same value forever after initialization. Invalidating getClassById FixedMetadataValue has no effect.
This class extends LazyMetadataValue for historical reasons, even though it overrides all the implementation methods. it is possible that in the future that the inheritance hierarchy may change.
Functions
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Returns the Plugin that created this metadata item.
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Invalidates this metadata item, forcing it to recompute when next accessed.