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Older-Kolibri Perseus export of a QTI Text entry item with an overflowing numeric answer ships invalid JSON #6231
Description
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Observed behavior
extract_value("1e400") returns inf. PerseusExerciseGenerator._process_input_answers keeps it (inf is truthy) and the numeric-input template renders "value": inf, which is not valid JSON.
Same for -1e400 and 1e0400. is_perseus_derivable returns True for all of them.
Errors and logs
json.loads on the rendered Perseus item raises JSONDecodeError.
Expected behavior
An item with an overflowing numeric answer is reported not derivable, so the node publishes QTI only.
User-facing consequences
Older Kolibri cannot load the item JSON, so learners get no exercise for the node.
Steps to reproduce
derive_perseus_item(_Item(_text_item("single", ["1e400"]))).- Run the result through
_process_input_answers, thenrender_to_string("perseus/input_question.json", ...). json.loadson the output fails on"value": inf.
Context
- Present on
unstable; independent of Older-Kolibri Perseus export drops QTI Text entry items whose numeric answers are valid xsd:double but not parseable byextract_value#6224. - A numeric gate that only checks
extract_value(...) is not None(Older-Kolibri Perseus export of QTI Text entry items has no answers when the accepted answers are not numbers #6222) passesinf; it needs a finite check. - Related: [QTI] Tracking issue -- UX enhancements #6103, Older-Kolibri Perseus export of QTI Text entry items has no answers when the accepted answers are not numbers #6222, Older-Kolibri Perseus export drops QTI Text entry items whose numeric answers are valid xsd:double but not parseable by
extract_value#6224, Numeric answers with a very small or very large mantissa and an exponent are not parsed byextract_value#6228
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rtibblesbot commentedon Sep 30, 2026
Plan: A QTI text-entry item whose correct answer parses to a non-finite number (
1e400,-1e400,1e0400) is not Perseus-derivable, so the node publishes QTI only.Assumptions — the issue did not settle these; say so if one is wrong.
extract_value; if the parser should returnNonefor non-finite, Numeric answers with a very small or very large mantissa and an exponent are not parsed byextract_value#6228 (local19ec005e5) already does so for exponents and this gate becomes redundant but harmless.abc) stay derivable here; if they should not be, that is Older-Kolibri Perseus export of QTI Text entry items has no answers when the accepted answers are not numbers #6222 and this gate must be folded into itsis not Nonecheck.INPUT_QUESTIONitems with a1e400answer still render invalid JSON via_process_input_answers; left out of scope, and a follow-up issue is needed if they should be fixed.1e-400→0.0) is finite and stays derivable; if a silent 0 answer is unacceptable, the gate needs a zero-vs-input check.@rtibblesbot's comments are generated by an LLM, and should be evaluated accordingly
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