Add try/wrap before consuming extant errors
Custom variables are applied at error level
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Revert "Custom variables are applied at error level"

This reverts commit 3cb48f83ec74bc7be07b29c304a0fa2e0f920dc1.
Error metadata lives above individual errors
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Pack custom data into options, not individual args
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Merge pull request #44 from duncanbeevers/0.2.1

0.2.1