Concatenate multiple quantity vectors or values. They must all be of the same type (i.e. you cannot combine e.g. a temperature and a mass value). The concatenated values will be scaled according to
best_metric. Note that the regular `c()` operator automatically calls this function if the first argument is a quantity object.
quantities to concatenate
#> <m (mass) in 'mg'> #>  5000 10 20#> <m (mass) in 'mg'> #>  5000 10 20