Do not swallow callback's ValueError#99
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This defers the tuple destructuring in callback execution out of the for-loop and places it in a tighter try/except block to protect against metaclass shenanigans. The
callback(...)call is therefore moved outside of the try/except block and anyValueErrors raised here do not get swallowed (resolves #98).There's also a small fix to the toml file to exclude the
envdirectory from black and isort. Following the contribution setup instructions this directory is placed inside the git repo but wasn't yet excluded from lint checks (both slowing linting down and failing for unrelated reasons).