A Promise that resolves to a string should be treated as non-binary

[hubgit]

I expected both of these types of input (a string, and a Promise that resolves to a string) to produce the same output:

var zip = new JSZip();
zip.file("file.txt", "Hèllo");
const output = await zip.file("file.txt").async("text");
// Hèllo

var zip = new JSZip();
zip.file("file.txt", Promise.resolve("Hèllo"));
const output = await zip.file("file.txt").async("text");
// H�llo

but the second version (where the input string is wrapped in a Promise) produces output text with incorrect encoding unless you explicitly set { binary: false }:

var zip = new JSZip();
zip.file("file.txt", Promise.resolve("Hèllo"), { binary: false });
const output = await zip.file("file.txt").async("text");
// Hèllo

[hubgit]

Closing as a duplicate of #325 (4 years later, this is still unexpected behaviour).