enhance(build): reduce footprint of unminified UMD bundle
enhance(build): reduce footprint of unminified UMD bundle

* Turn on mangling except for function names.

* Reduce indentation level from `4` to `2`

* Reduces footprint from `9.99 kB` => `6.33kB`

emilio-martinez/is-datatype,emilio-martinez/is-datatype,emilio-martinez/is-datatype