get = function( unit, form, cldr ) {
	var ret;

	// Ensure that we get the 'precomputed' form, if present.
	unit = unit.replace( /\//, "-per-" );

	// Get unit or <category>-unit (eg. "duration-second").
	[ "" ].concat( unitCategories ).some(function( category ) {
		return ret = cldr.main([
			"units",
			form,
			category.length ? category + "-" + unit : unit
		]);
	});

	// Rename keys s/unitPattern-count-//g.
	ret = stripPluralGarbage( ret );

	// Compound Unit, eg. "foot-per-second" or "foot/second".
	if ( !ret && ( /-per-/ ).test( unit ) ) {

		// "Some units already have 'precomputed' forms, such as kilometer-per-hour;
		// where such units exist, they should be used in preference" UTS#35.
		// Note that precomputed form has already been handled above (!ret).

		// Get both recursively.
		unit = unit.split( "-per-" );
		ret = unit.map(function( unit ) {
			return get( unit, form, cldr );
		});
		if ( !ret[ 0 ] || !ret[ 1 ] ) {
			return;
		}
	}

	return ret;
}
get( unit, form, cldr )

@unit [String] The full type-unit name (eg. duration-second), or the short unit name
(eg. second).

@form [String] A string describing the form of the unit representation (eg. long,
short, narrow).

@cldr [Cldr instance].

Return the plural map of a unit, eg: "second"
{ "one": "{0} second",
  "other": "{0} seconds" }
}

Or the Array of plural maps of a compound-unit, eg: "foot-per-second"
[ { "one": "{0} foot",
    "other": "{0} feet" },
  { "one": "{0} second",
    "other": "{0} seconds" } ]

Uses the precomputed form of a compound-unit if available, eg: "mile-per-hour"
{ "displayName": "miles per hour",
   "unitPattern-count-one": "{0} mile per hour",
   "unitPattern-count-other": "{0} miles per hour"
},

Also supports "/" instead of "-per-", eg. "foot/second", using the precomputed form if
available.

Or the Array of plural maps of a compound-unit, eg: "foot-per-second"
[ { "one": "{0} foot",
    "other": "{0} feet" },
  { "one": "{0} second",
    "other": "{0} seconds" } ]

Or undefined in case the unit (or a unit of the compound-unit) doesn't exist.