Fix deserialization by giving type annotations.
Fix deserialization by giving type annotations.

koverstreet/num,rust-num/num-bigint,rust-num/num-integer,rust-num/num,vks/num,rust-num/num-integer,rust-num/num,koverstreet/num,rust-lang/num,rust-num/num-traits,DonSheddow/num,rust-lang/num,rust-num/num-bigint,DonSheddow/num,vks/num,rust-num/num-traits