Charge lent answers to the payload budget

A read answered with extents of the store mapping was charged nothing,
so clients that stopped reading could keep any number of old file
versions mapped. The runtime core now takes resources a host sends in
pieces: body.data is NULL, body.size is charged like any other resource,
the outcome has no body to read and cannot be forwarded. pure-serve hands
the mapping reference over as such a resource, so a lent answer holds its
bytes of budget until it is in the socket and its ticket releases the
mapping; past the budget a read gets 503 payload_budget, as a copied one
would. The async core grows 52 bytes (5,776 of its 6,144).

0 files changed, 0 insertions, 0 deletions