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What changes were proposed in this pull request?
valid_layers
andhas_layer
methods for easy checking of valid layers and ignoring invalid inputvalid_layers
, restoring the old behaviour where non-existing layers are ignored instead of causing errorsWhy are the changes needed?
quality of life
Does this PR introduce any user-facing change? If yes is this documented?
yes, new methods have docstrings
How was this patch tested?
added more tests for layering
Issues
Are there any further changes required?
Current behaviour for edges can be weird as they have two ways to specify layer (see #1458)