Checks if x is proportions vector - non-missing dbls between 0 and 1 that sum to 1.
check_props(x, x_name = substitute(x), error = TRUE)The object to check.
A string of the name of the object x.
A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.
An invisible copy of x (if it doesn't throw an error).