mergedata, etc.: what happens with duplicate keys?

"[email protected]" <[email protected]>
Newsgroups gmane.comp.sysutils.cfengine.general
Message-ID <[email protected]>
All the documentation and examples about "mergedata" (and bundle "cmerge", 
etc.) seem to be based on non-overlapping data sets.  For example, with two 
simple key:value JSON datasets, the examples and documentation have no 
overlap of keys.

But what is supposed to happen when the same key, and with potentially 
different value, appears in both JSON datasets?

My proposed use-case is two simple JSON key:value datasets. The first can 
be regarded as a full and complete set of default key:value pairs; the 
second is smaller and contains override values for a subset of those same 
keys.  The desired result would be that full set as modified by the 
overrides.

There seems to be no documentation describing how this is handled, not even 
whether it is regarded as an error condition.  If it is documented 
somewhere, it seems well hidden.

If I should be using something else rather than "mergedata", let me know.

Any thoughts?  Primarily about my proposed use-case, but also about 
improving the documentation (e.g. at function "mergedata") to describe this 
case of same-key merging.

Assume CFE 3.12, but if CFE 3.15 would be different, that would be 
possible.  (By the way my reading of documentation also included some 3.18.)

-- David Lee

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