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What is the history of “may” being used to mean “must”?

According to (online) Merriam-Webster, “may” has the following two distinct definitions, among others

1 b: have permission to

4: SHALL, MUST —used in law where the sense, purpose, or policy requires this interpretation

Oxford dictionary does not seem to have the definition of may = shall, must.

What is the history of may being used to mean “must”?

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