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Then, over the last week, online researchers found that Persona, another company Discord had partnered with in the UK for age verification, had left thousands of files exposed on the open internet.
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Cyrillic homoglyphs: the real threat
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.