Sometimes it is necessary to preprocess some initial bit
of a stream data before giving the entire stream
to the main processing function. Sometimes this bit should be extracted
from the stream before the main processing; sometimes it should be
returned to the stream. This test checks an order of stream
modes, methods and events for a possible preprocessing algorithm.
Stream BOM stripping is selected as a use case.
See https://github.com/nodejs/help/issues/221 as the prehistory.
PR-URL: https://github.com/nodejs/node/pull/7741
Reviewed-By: Anna Henningsen <anna@addaleax.net>
