Modules: introduced Buffer alternatives for object properties.

Modules: introduced Buffer alternatives for object properties.

Buffer variant returns the property bytes as is, whereas the string
version may convert bytes invalid in UTF-8 encoding into replacement
character.

HTTP
new request object properties:
r.reqBody (r.requestBody),
r.resBody (r.responseBody),
r.vars (r.variables).

Stream
new stream object properties:
s.vars (s.variables).

new events:
The events' callbacks are identical to the string counterparts, except the data
argument:
upstream (upload),
downstream (download).