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Dictionary which uses normalized URIs as keys.
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Load a schema from ./schemas/``name``.json and return it.
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A dumb version of `textwrap.indent` from Python 3.3.
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Construct a single string containing indexing operations for the indices.
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Return the set of additional properties for the given ``instance``.
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Create an error message for extra items or properties.
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Create an error message for a failure to match the given types.
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isinstance() can accept a bunch of really annoying different types:
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Check if all of a container's elements are unique.
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falls back on them being sortable, and finally falls back on brute
force.
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