assigns the prr constants
defines or returns the constants used within /prr/. The performed action depends on the argument.
whi=="reset" nothing (but the
assignments of the layer(s)
prr are performed).
whi=="names" the names as a character vector are returned.
whi=="definitions" the definitions as a named character
vector are returned.
whi=="values" the values through
a named list are returned.
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