Currency - prepending units

[pseudomonas]

| £3
No such unit £3, did you mean £?

(per the 0.8.0 web interface at https://rinkcalc.app/ )

Given that £n ($n,€n…) is the usual way of writing sums of currency in English, Rink should accept £3 as being equivalent to 3£ or £ 3 (both of which are apparently accepted).