Uutf.ManualManual sources and destinations.
Warning. Use only with `Manual decoder and encoders.
src d s j l provides d with l bytes to read, starting at j in s. This byte range is read by calls to decode with d until `Await is returned. To signal the end of input call the function with l = 0.
val dst_rem : encoder -> intdst_rem e is the remaining number of non-written, free bytes in the last buffer provided with Manual.dst.