fix for issue 1484 raised and solved by Graham Klyne:

[ghost]

Error reading JSON-LD from text IO stream

Fix and test provided by Graham Klyne, transcribed into a separate branch.

Confirmatory results from the “validate.yaml” workflow are here

[nicholascar]

Thanks Graham Klyne & Graham Higgins!

[aucampia]

I'm actually unsure if this condition will be true given this code from rdflib.parser.FileInputSource:

rdflib/rdflib/parser.py

Lines 239 to 244 in 9379a69

	if isinstance(file, TextIOBase): # Python3 unicode fp
	self.setCharacterStream(file)
	self.setEncoding(file.encoding)
	try:
	b = file.buffer
	self.setByteStream(b)

[gklyne]

FWIW, I was trying to home in on the error that was triggered by trying to parse the output from json.dump, which specifically caused the stream result from source.getByteStream() to be a character stream. I agree that seems not quite right, and the problem may lie deeper in the logic that sorts out the data stream to be parsed.

But I was also trying to identify a minimal fix that could solve my immediate problem. Hopefully if someone chooses to delve deeper into the create_input_source logic, the test cases provided will still be helpful.