ImperialLengths extension

Convenience extension methods. Not provided for obscure units. Pretty easy to implement, if desired (or for another library to build on top)

on

Methods

feet() Feet

Available on num, provided by the ImperialLengths extension

Nor "foot", nuh uh, won't do it.
inches() Inches

Available on num, provided by the ImperialLengths extension

I'm not going to bother with "inch" for 1 to be grammatically correct...
miles() Miles

Available on num, provided by the ImperialLengths extension

and mile is right out!
yards() Yards

Available on num, provided by the ImperialLengths extension

yard? not a chance!