The function ol.proj.equivalent is used for comparing two projections,
but not exposed publicly. It should be accessible using a public API to
be able to compare projections in the same way as OpenLayers does.
A test for the ol.proj.equivalent function itself already exists in
https://github.com/openlayers/ol3/blob/master/test/spec/ol/proj/proj.test.js
github issue #4913
Provide an API to refresh a source and reload its data in an associated
layer, as for example already loaded tiles in a ol.source.Tile source
are not refreshed. Additionally a test for the new
ol.source.Source.refresh() function is provided.
Currently internal state is not cleaned up, e.g. already loaded tiles
in a `ol.source.Tile` source are still cached and not reloaded at all.
github issue #4867 (https://github.com/openlayers/ol3/issues/4867)
Sebastian Baumhekel