New use of `isPrimary` that began in `w_2021_12`

[jeffcarlin]

Thanks, Fred - this is really helpful! I have a couple of initial questions (and need some more time to digest the details):

@fred3m

An easy way to get unique sources is to remove all of the sources with detect_isPatchInner==True & detect_isTractInner==True

Does this mean to say to select sources with these flags set to True, or am I misunderstanding?

@fred3m

The detect_isPrimary flag can be thought of as a flag to include the most common catalog of unique sources that users will want to make measurements on. Note that this completely excludes sources in overlap regions, whereas any analysis will likely also want to include some selection criteria to choose which version of sources from the overlap region to use.

Is this a change from previous behavior for detect_isPrimary? I think that in the past this flag did not completely ignore the overlap regions. If it really does leave out overlap regions, then could you clarify which flag(s) one would use to select “the best measurement of all well-measured sources?” I recognize that this is vague/ambiguous, but am just thinking about what a typical user might select as a “clean” catalog for their science.