FIBERSTATUS VARIABLETHRU bad for sky and stdstars #2323
Merged
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This PR adds FIBERSTATUS bit VARIABLETHRU to the mask of bad bits that should not be used for sky fibers and standard stars.
Most of the changes here are adding comments and unit tests to confirm current behavior; excluding VARIABLETHRU for sky and stdstars is the only functional change here.
After discussing with @julienguy, we decided to treat NEARCHARGETRAP as strictly informative and not exclude it from sky fibers since it is actually a per-AMP problem, not a per-FIBER problem, but we don't structurally have a way to encode that.
Related to #2304.