@mmacedoeu did a good deal of work to show that Arc instead of Rc
wasn't too difficult in #656, and @rnewman pushed the refactoring
across the line in #659. However, we didn't flip the switch at that
time. For #673, we'd like to include TypedValue instances in errors,
and with error-chain (and failure) error types need to be 'Sync +
'Send, so we need Arc.
@mmacedoeu did a good deal of work to show that Arc instead of Rc wasn't too difficult in #656, and @rnewman pushed the refactoring across the line in #659. However, we didn't flip the switch at that time. For #673, we'd like to include TypedValue instances in errors, and with error-chain (and failure) error types need to be 'Sync + 'Send, so we need Arc.
This builds on #659 and should also finish #656.