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Convert NULLCPO to NULL, leave other values intact.
NULLCPO
NULL
nullcpoToNull(cpo)
[CPO | NULL]. NULL if cpo is NULLCPO, cpo otherwise.
CPO
cpo
[CPO] The cpo.
Other NULLCPO related: NULLCPO, is.nullcpo(), nullToNullcpo()
is.nullcpo()
nullToNullcpo()