createReadStream/createWriteStream should support FileHandle

[ronag]

Currently only raw file descriptors are supported. Should we allow for a FileHandle to be passed as fd?

[mmomtchev]

Any advantages over simply using FileHandle.fd? 😃

[ronag]

Any advantages over simply using FileHandle.fd? 😃

Yes, closing the file handle would close the fd which would corrupt the stream, i.e. the reference counting is bypassed.

[mmomtchev]

Suddenly this appears much more needed, I will take it of no one is already working on it?

[ronag]

@mmomtchev go for it!