Parser error on non-json body

[w-a-b]

This library seems to be abandoned, but I post this in case others stumble upon the same problem (ended up using raw fetch instead of apicase for this):

If I invoke an endpoint that returns an Image / ReadableStream, I will get a JSON.stringify error unless I specify a parser other than "json" in the payload. The param should be a String, according to the docs:

// Response parser // default: 'json' "parser": String,

However, the code seems to expect an object like

{done: 'someParser', fail: 'json'}

And even with the parser-option defined like this, it will then fail on line 95 of index.js:
return res[parser]()

Why does the line above expect a parser function on the raw res(ult)-object from fetch?