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< yy)aw Websocket masking function.
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`mask` is a `bytes` object of length 4; `data` is a `bytearray`
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object of any length. The contents of `data` are masked with `mask`,
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as specified in section 5.3 of RFC 6455.
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Note that this function mutates the `data` argument.
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This pure-python implementation may be replaced by an optimized
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