feat: make async Write::flush
a required method
#696
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This PR makes
embedded-io-async
'sWrite::flush
method a required method, meaning all implementors have to implement it.This aligns this method with
std
'sWrite::flush
andembedded-io
'sWrite::flush
.This PR is more a question than a proposal.
I could not find any documented reasons for the async
flush
being a provided method.If this turns out to be intentional, I am happy to leave it as is and document the reason instead.
CC: @Dirbaio, who added this in the initial design (
d6f6419
).