* [all] Adds strict spec option
Introduces an option to allow user customization of strict specification
behaviors. For instance, OpenAPI 3.x requires a path object name to be
prefixed with '/' so we append any missing '/', but this may not be
desirable to some users or generators. In this commit, this fix specifically is
the only modification affected.
* Clarify strict-spec docs, add option to README.md
* Update CLI options in docs/usage.md
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