actor FileStream is OutStream
"""
Asynchronous access to a File object. Wraps file operations print, write,
printv and writev. The File will be disposed through File._final.
"""
let _file: File
new create(file: File iso) =>
_file = consume file
be print(data: ByteSeq) =>
"""
Print some bytes and insert a newline afterwards.
"""
_file.print(data)
be write(data: ByteSeq) =>
"""
Print some bytes without inserting a newline afterwards.
"""
_file.write(data)
be printv(data: ByteSeqIter) =>
"""
Print an iterable collection of ByteSeqs.
"""
_file.printv(data)
be writev(data: ByteSeqIter) =>
"""
Write an iterable collection of ByteSeqs.
"""
_file.writev(data)
be flush() =>
"""
Flush pending data to write.
"""
_file.flush()