drupflare/worker - v1.0.4
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    Variable MAX_MAIL_BYTESConst

    MAX_MAIL_BYTES: 1000000 = 1_000_000

    The largest message the queue accepts; the 2,199,995-byte Durable Object record binds, not Cloudflare's 5 MiB. 1 MB leaves room for the JSON envelope.