FA-12533 / Biological sequence representation / Member archive

DNA and RNA normalization silently changes molecule type · case 03

DNA and RNA normalization silently changes molecule type.

Member previewVariant 3 · 3 implementations · 6 checks per implementation

Case contract

Return uppercase input if every symbol belongs to ACGTN for type DNA or ACGUN for type RNA; otherwise None. Type is DNA or RNA. No cross-type conversion.

Why this case matters

An offline abstract sequence-data model; useful for testing representation invariants without biological inference.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
variable mixed DNA	`"AAAT"`	`null`	Failed

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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