2026年7月16日

Reading What’s Already There: A Field Guide to PDF Annotation Export

By xiezixing 2026年7月16日

A field guide to lifting reviewer markup — highlights, sticky notes, stamps, links — out of a PDF and into structured JSON your scripts can use. Walks nine subtypes, seven extracted fields, and three workflow patterns.

Global phone validator field guide poster

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The Phone Number Is Not a String: A Global Validator Field Guide

By xiezixing 2026年7月16日

A practical field guide to country context, canonical output, readable formatting, and the failure modes that make phone validation look easier than it is.

XML to JSON conversion: five dials, eight questions, one conversion

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XML to JSON Converter: five dials, eight questions, one conversion

By xiezixing 2026年7月16日

A mental model for the five dials the XML to JSON converter actually exposes — pretty print, attributes, namespaces, single-element arrays, and the implicit mixed-content corner — plus the eight-question check that catches every silent loss of fidelity before you trust the output.

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Rotate Secrets Before They Become Incidents

By xiezixing 2026年7月16日

A practical four-week plan for turning a messy .env file into an owned, staged, and reversible credential lifecycle.

Basketball Stats Calculator cover poster: three formulas, one career, zero magic. eFG%, TS%, PER mental model.

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Basketball Stats Calculator: Three Formulas, One Career, Zero Magic

By xiezixing 2026年7月16日

Box scores lie. eFG%, TS%, and PER redraw the comparison — three formulas, one calculator, and the interpretation work the spreadsheet skips.

The Half-Life Equation, Five Ways - cover image

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The Half-Life Equation, Five Ways: A Field Guide to Exponential Decay

By xiezixing 2026年7月16日

Same e^(-λt), three different worlds. How one equation drives isotope calibration in nuclear medicine, drug accumulation in pharmacokinetics, and radiocarbon dating in archaeology.