fix: OPTIONS
fix: s/content-type/content_type/g
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mergeContent: leave unmentioned property sheets in posted objects alone rather than dropping them.
lense api cleanup
fix: instantiation of optional property sheets in DB root value.
fix: overwrite existing property sheets on PUT.  (only leave unlisted ones intact.)
fix: collect hole fields and maps in instance Value JSSchema
fix: POST response does not carry 'data' attribute.
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version handling stub
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round out incomplete objects from requests using validator schema before validating them.
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fix: test suite
better/more source comments
new App snaplet name