Added a validation that constraints have an upper bound
feature #25 Added a validation that constraints have an upper bound (stof)

This PR was merged into the master branch.

Discussion
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Added a validation that constraints have an upper bound

This will prevent issues like the one fixed in https://github.com/sensiolabs/security-advisories/commit/11c28665e17bc3cdb572733963e4dca1431375db

Commits
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28dec7c Added a validation that constraints have an upper bound