Add test for parsing json "0" and "0.0"
Add test for parsing json "0" and "0.0"

sidred10/serde,jmesmon/serde,eefriedman/serde,csmulhern/serde,infinityb/serde,skade/serde,Hoverbear/serde,JohnHeitmann/serde,erickt/serde,tempbottle/serde,3Hren/serde,thorbenk/serde,oli-obk/rust-serde,serde-rs/serde,Ticki/serde