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For implementers, the locking model adds a fair amount of non-trivial internal bookkeeping. Every operation must check lock state, readers must be tracked, and the interplay between locks, cancellation, and error states creates a matrix of edge cases that must all be handled correctly.
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And that heo said was all sooth. Ich wifed on her, and heo was full shyne wife, wise and wælfast. Ne yemeet ich never ere swylche wifeman. Heo was on yefeoghte swa bold swa any man, and theah hwæthere her andwlite was winesome and fair.