libastring-ocaml 0.8.3-1build1 (riscv64 binary) in ubuntu focal

 Astring exposes an alternative String module for OCaml. This module
 tries to balance minimality and expressiveness for basic, index-free,
 string processing and provides types and functions for substrings,
 string sets and string maps.
 .
 Remaining compatible with the OCaml String module is a non-goal. The
 String module exposed by Astring has exception safe functions,
 removes deprecated and rarely used functions, alters some signatures
 and names, adds a few missing functions and fully exploits OCaml's
 newfound string immutability.
 .
 This package contains runtime files.