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Library / First Principles Framework (FPF) - Core Conceptual Specification
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E.15:4.5 - Preserve the predecessor by independent probes

For a material rewrite, derive a predecessor-use inventory from the predecessor itself before relying on the author’s preservation map. Include each distinct working situation, first move, input, condition, result, prohibition, example function, consequence, source-derived contribution, and consumer-facing promise that the predecessor actually carried.

Then test each probe against the candidate:

  • preserved: the same practical or semantic function remains;
  • changed intentionally: the successor decision names the new function and why;
  • moved: an exact current locus still supplies it without making discovery worse;
  • retired: an explicit decision removes it and states the affected use;
  • lost or unresolved: repair it or return it before claiming continuity.

Exact copied text may close by identity. A large deletion, compression, move, or rewrite does not close through line count, author intent, or a high-level summary. The independent inventory need not become a permanent row-by-row file when the receiving workflow needs only the verified candidate and aggregate result, but the inspection itself must be complete.