tests/core/test_utf.c

#include <stdio.h>
#include <emscripten.h>

int main() {
  char *c = "μ†ℱ ╋ℯ╳╋ 😇";
  printf("%d %d %d %d %s\n", c[0] & 0xff, c[1] & 0xff, c[2] & 0xff, c[3] & 0xff,
         c);
  emscripten_run_script(
      "cheez = _malloc(100);"
      "Module.stringToUTF8(\"μ†ℱ ╋ℯ╳╋ 😇\", cheez, 100);"
      "Module.print([Pointer_stringify(cheez), Module.getValue(cheez, "
      "'i8')&0xff, Module.getValue(cheez+1, 'i8')&0xff, "
      "Module.getValue(cheez+2, 'i8')&0xff, Module.getValue(cheez+3, "
      "'i8')&0xff].join(','));");
}