Module tokenizers::utils

Modules

iter	This comes from the Rust libcore and is duplicated here because it is not exported (cf https://github.com/rust-lang/rust/blob/25091ed9b7739e12466fb2490baa1e8a2815121c/src/libcore/iter/adapters/mod.rs#L2664) We are now using the version from https://stackoverflow.com/questions/44544323/how-to-unzip-a-sequence-of-resulta-b-e-to-a-veca-vecb-and-stop-on-f because the one from the libcore seems to cause overflowing stacks in some cases
padding
truncation