OptionalincludeIf set to true internal layers (myLayer.internal === true) are included in the returned array of layers.
This includes system layer as well, such as the layer for highlights or geolocation, which were not explicitly added to the map.
By default, internal layers are not returned.
OptionalsortIf set to true, layers will be ordered by their display order:
Layers listed first in the returned array are shown below layers listed at a later index.
By default, layers are returned in arbitrary order.
These options can be used by some APIs returning an array of layers (or sublayers).