A W3C HTML JSON forms spec compliant field appender (for lack of a better name). Useful for people implementing application/x-www-form-urlencoded
and multipart/form-data
parsers.
Install a transform to require.extensions
that always runs last, even if additional extensions are added later.
Combines a list of arrays, returning a single array with unique values, using strict equality for comparisons.
Append the contents of one stream onto another.