[mikemaccana]

A targeted pass over quicknode/solana-book#266 and quicknode/solana-program-examples#195. It checked every changed line against the code, the figures and the rest of the book, then had an independent agent re-check every fix. Merge quicknode/solana-program-examples#196 first: the lending chapter describes code that ships there.

The lending program, as the book now describes it

• Liquidation takes no account a borrower controls. It closes an emptied collateral vault into the obligation, and close_obligation() later returns that rent to the owner. This fixes a security hole Time chapter: plain wording, the timestamp's real error, a simpler decision tree, and no repetition #195 introduced.
• Borrow rates are capped at 300% a year (BorrowRateAboveCeiling).
• The liquidation bonus must be payable at the threshold (LiquidationBonusUnpayable).
• An update may raise a reserve's liquidation threshold but never lower it (RiskLimitLowered). The loan-to-value may still be lowered to stop new borrowing.
• Bad debt: an obligation a liquidation leaves with debt and no collateral stays open until it is repaid, as the author decided.

Fixed

• False generalizations: about closing accounts and about payout handlers.
• The liquidation gloss in Core Building Blocks, which described selling collateral rather than repaying debt at a bonus.
• Test descriptions that claimed more than their tests assert: the pause tests, the fundraiser's refusal tests, and two lending tests.
• Single wrong statements:
  • the perps accumulator definition;
  • the options put sentence;
  • the order book's minimum-size and tree-depth sentences;
  • the glossary's unsettled balance and base token entries.
• Conclusion: the incentive sentence now covers programs with no operator. The answer to the Introduction's promise to be responsible for your programs is restored.
• Order book: the close section now follows the fee withdrawal, whose figure still draws both orders. The handler list now sits inside its box.
• Lending figures: obligation boxes show what each step's handler stores, not what a later refresh would write.
• The arithmetic chapter's K-check sentence and the restored rule about what the Operating chapter's bounds protect.

Print

Merged with main's new build scripts. PRINT-SPECIFICATION.md takes main's description of them, and this branch's build matches its numbers:

• Pages: 307 paperback interior, 309 digital.
• Spine and wrap: a 0.691in spine and a 15.821 x 9.94in wrap, which npm run build-pdf-paperback writes to build/cover-kdp-307pp-white.pdf.
• Blank pages: nine before chapters and part titles, counted in the October 6 build.

Two footnote calls moved, so Paged.js no longer drops text at a page break; the build's overflow check caught both.

npm run lint, node scripts/check-figure-geometry.mjs (115 figures), npm run build-pdf-paperback and npm run build-pdf-digital all pass.

🤖 Generated with Claude Code

https://claude.ai/code/session_01UX53A6YR1Hjr8z6WzJxf2q