Read exactly $(D_PSYMBOL n) bytes. Raise an $(D_PSYMBOL
IncompleteReadError) if the end of the stream is reached before
$(D_PSYMBOL n) bytes can be read, the $(D_PSYMBOL
IncompleteReadError.partial) attribute of the exception contains the
partial read bytes.
Read exactly $(D_PSYMBOL n) bytes. Raise an $(D_PSYMBOL IncompleteReadError) if the end of the stream is reached before $(D_PSYMBOL n) bytes can be read, the $(D_PSYMBOL IncompleteReadError.partial) attribute of the exception contains the partial read bytes.