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Member handlers used to always call .toString on REPL results, even when
:silent was on, which could force evaluation or cause unwanted side
effects.
This forwards the current value of `printResults` to the member
handlers (through Request) for them to decide what to do when the
results must not be printed.
2 handlers now do not return any extraction code when silent:
- ValHandler, so that it doesn't call toString on the val
- Assign, so that it doesn't call toString on the right-hand side
of the assignement.
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