COSESAI

Luhn Checksum Field Guide: When One mod-10 Walk Beats Eight Different Identifier Pipelines

By xiezixing 2026年10月11日

A field guide to the four-step Luhn algorithm, the eight identifier families that depend on it, and the three failure modes that silently ship past unit tests.

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TPN Macronutrient Calculator Field Guide When Three Numbers Per Bag Decide the Full Audit

By xiezixing 2026年10月11日

A TPN prescription is three numbers per macronutrient — dextrose percent and volume, amino-acid percent and volume, lipid emulsion percent and volume — and the audit turns those into kcal, kcal-to-N ratio, and per-kg readings against the ASPEN 2016 and ESPEN 2019 grid.

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BOM Character Remover — Field Guide: When an Invisible Three Bytes Eat Your First CSV Column

By xiezixing 2026年10月11日

A practical field guide to BOM detection, the four places one hides, and the rules for removing it without corrupting the rest of your file.

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Bernoulli Equation Solver Field Guide: When a Negative Radicand Surfaces the Upstream-Downstream Pairing Mistake Before Any Pipe Is Welded

By xiezixing 2026年10月11日

A negative radicand is the Bernoulli solver telling you the flow cannot exist. Why the upstream-downstream pairing mistake surfaces before any pipe is welded.

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