To improve security, we will soon start forcing password resets for any account that uses a weak password on the next login. If you have a weak password or a defunct email, please update it now to prevent future disruption.
Is the answer to that question in the documentation ? Yes.
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"There are two kinds of labels: global and local labels. Global labels live in one global scope shared across all project files and thus should have unique names per game. Local labels logically reside inside the scope of the global label they are declared in." Emphasis is mine.