Remediate malformed return during the twin transfer #771
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Fix #769
Try-catch can be used only on external calls/contract creation, therefore it needed to be handled differently.
The most concise way (and without the need for assembly) was to say that return is valid iff its length is 0 or length is 32 and decoded into uint256 its value is exactly 1 (corresponds to
true
if considered a boolean).