A task retry that moved to another plugin or channel kept the previous
attempt's usage expression. A retry from an expression-priced plugin to
one priced per request charged, and later settled, at the first plugin's
price. Each attempt now prices itself from scratch.
A retry to a more expensive channel was topped up only after the
upstream had accepted the task. A user who could not cover the
difference went into arrears, or the task was dropped while the upstream
was already running it. The retry now raises the reservation before the
request is sent, with the same balance check as the first pre-consume,
and a channel the balance cannot cover is never called.
A wallet top-up taken before submission replaced the amount held by the
first pre-consume instead of adding to it, so a request that then failed
refunded only the top-up. Image requests whose quantity was raised
before submission were affected too. The full amount is now refunded.
CaIon
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