Another thing I noticed is a comment in BufferedCoordinateOperationFactory:
The pool of cached transformations. This map can not be static, because
the values may
be different for the same ({@code sourceCRS}, {@code targetCRS}) pair
dependending of
hint values like {@link Hints#LENIENT_DATUM_SHIFT}.
But, my jmap only show 2 instances (when doing both Orthographic and
Stereographic) of BufferedCoordinateOperationFactory so, at the end, is like
having a static pool of cached transformations.
That pool holds instances of CRSPair's, which show in 100's of thousands
instances in my jmap.
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