**MUST** avoid including redundant comments which are tautological or self-demonstating (e.g. cases where it is easily parsable what the code does at a glance or its function name giving sufficient information as to what the code does, so the comment does nothing other than waste user time)
writevSync(batch) { for (const c of batch) addChunk(c); return true; },
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if (len1 === 0) return [];