[PROJ] How to not take the direct transformation

[Javier Jimenez Shaw]

Hi

There is a "feature" in PROJ that is sometimes inconvenient: if there is a
direct transformation from A to B, it is not searching for better options.

That can be really annoying in some cases, and confusing as well.

Is there any way to "disable" it? something in the context? an environment
variable?

Example:
If I transform from WGS84 to NAD83(2011) it is going to use the
transformation
https://epsg.org/transformation_9774/NAD83-2011-to-WGS-84-1.html, that is a
no-op, with 2m accuracy.
However from WGS84 to NAD83(2011)+NAVD88 it is taking a more complicated
transformation for the horizontal values. That is very confusing. It
happens in other situations (that of course I cannot remember now).

I understand that changing the current behaviour could be to big (we can
discuss if it makes sense or not), but having a way to disable that
"optimization" would be great.

Thank you

Cheers
Javier.
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