Reject non-finite retry values in writeSSE - #5302
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event and id already throw on CR/LF. retry was interpolated as-is, so a string with line breaks could split the SSE frame. Require a finite number, which also covers retry: 0.
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writeSSEalready throws ifeventoridcontain CR/LF.retrywas concatenated as-is, so a non-number with line breaks could split the SSE frame.Require a finite number before emitting
retry:.retry: 0still works.Fixes #5299