Fatal: Module::addExport: empty name when using binaryen.js

Using a release version of Binaryen.js, I am (sometimes) hitting an assertion Fatal: Module::addExport: empty name when calling the C API's _BinaryenAddGlobalExport:

  addGlobalExport(
    internalName: string,
    externalName: string
  ): ExportRef {
    var cStr1 = this.allocStringCached(internalName);
    var cStr2 = this.allocStringCached(externalName);
    console.log(internalName, cStr1, readString(cStr1), externalName, cStr2, readString(cStr2));
    return binaryen._BinaryenAddGlobalExport(this.ref, cStr1, cStr2);
  }

logging

src/types/Type.i64 6075288 src/types/Type.i64 Type.i64 16669480 Type.i64

indicating that the string arguments are not empty (or null) and can be read back properly.

The error goes away when using a debug build with https://github.com/WebAssembly/binaryen/pull/3311 applied.

Start by reproducing the failure through Binaryen.js and the C API entry point _BinaryenAddGlobalExport in a release build, then compare it with a debug build using pull request 3311. Done means valid non-empty names no longer trigger the Module::addExport assertion in the release build.