const compress/flate.windowMask

5 uses

	compress/flate (current package)
		deflate.go#L34: 	windowMask    = windowSize - 1
		deflate.go#L220: 			d.hashPrev[di&windowMask] = *hh
		deflate.go#L277: 		i = int(d.hashPrev[i&windowMask]) - d.hashOffset
		deflate.go#L428: 			d.hashPrev[d.index&windowMask] = uint32(d.chainHead)
		deflate.go#L475: 						d.hashPrev[index&windowMask] = *hh

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