Also de-duplicate 32- and 64-bit number formatting on wasm32
Also de-duplicate 32- and 64-bit number formatting on wasm32

graydon/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust