If you turn on -Wconversion and off -Werror, some of the warnings that come out are from java.desktop. We'd like to eventually have this warning for Hotspot code. Can these warnings be cleaned up? This is a sample.

src/java.desktop/share/native/libharfbuzz/OT/Layout/GSUB/Ligature.hh:159:16: warning: conversion from 'hb_codepoint_t' {aka 'unsigned int'} to 'uint16_t' {aka 'short unsigned int'} may change value [-Wconversion]
  159 | ligGlyph = ligature;
      | ^~~~~~~~

src/java.desktop/share/native/libharfbuzz/hb-open-type.hh:859:17: warning: conversion from 'unsigned int' to 'uint16_t' {aka 'short unsigned int'} may change value [-Wconversion]
  859 | arrayZ[i] = *items;
      | ~~~~~~~~~~^~~~~~~~
src/java.desktop/share/native/libharfbuzz/OT/Layout/GSUB/../../../hb-ot-layout-gsubgpos.hh:2985:27: warning: conversion from 'unsigned int' to 'short unsigned int' may change value [-Wconversion]
 2985 | c->copy ((HBUINT16) g);
      | ^