Find S3 method from its name
Examples
s3_get_method(mean.Date)
#> function (x, ...)
#> .Date(mean(unclass(x), ...))
#> <bytecode: 0x61539ecfa888>
#> <environment: namespace:base>
s3_get_method(weighted.mean.Date)
#> function (x, w, ...)
#> .Date(weighted.mean(unclass(x), w, ...))
#> <bytecode: 0x61539edc3888>
#> <environment: namespace:stats>