If I call `write-bytes` with mutable byte string S with value A, and
then, immediately after return from the call, I mutate S to value B...
is it nevertheless guaranteed that value A will be written?
I think this behavior is unspecified right now (regardless of what the
current implementation does). I either need it specified, or to assume
that I can't mutate S. (Reason I'd like to mutate it is templates for
protocol frames with both constant and variable bytes, if the byte
string is always going to be sent or copied before `write-string`
returns anyway.)
Neil V.
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