## Chapter 16 — Official source is a stored Boolean ### Lesson map Lesson 16. Map, example, EX062. ```mermaid flowchart TD L["Literal True"] --> K["Key: official source used"] K --> P["Bracket x"] U["A page address"] --> Q{"Is an address stored?"} Q -->|No| R["The tick is not a fetch"] ``` The prose names a page. The dictionary stores a Boolean. ### Logical drawing ```text "official source used": True URL stored: none request performed by the script: none printed bracket: [x] ``` ### Learning outcomes After this chapter, you should be able to: 1. Treat this tick as a literal `True`. 2. Keep the official-page sentence in the prose. 3. Refuse a URL the dictionary does not hold. ### 16.1 True does not remember an address. The first pair in `checks` is the string `official source used` mapped to the literal `True`. Unlike the hash pair, this pair does not compute anything. The loop cannot tell a computed true from a written true. Both print `[x]`. The difference is in the source: one value is an equality of digests, and this value is a constant. The earlier lesson says the archive was taken from the plugin's official page. The dictionary does not store that address, the publisher's name, or a retrieval time. A constant `True` would remain `True` even if the sentence about the page were deleted from the prose, and the sentence can be true in the story while a different run stored `False`. This run stores `True`. Wermke et al. (2022) study how maintainers talk about trust. Their interviews are not this Boolean. Johnson et al. (2013) study why developers skip static-analysis tools. No static-analysis tool is invoked here. Host terms still bound what Owen may test. The constant does not record that he read them. It records only that the checklist author set the bit. | Question | Answer in this file | |---|---| | What is stored? | The literal `True` | | What is printed? | `[x] official source used` | | Is a URL stored? | No | | Does the script request a page? | No | ### 16.2 Worked example | Claim | Source of the bit | Decision | |---|---|---| | The first bracket is `x` | The literal `True` | Keep | | The official page is a prose sentence | No URL field | Keep | | "The script saved the download address." | The value is a Boolean | Refuse | | "The tick proves a request succeeded." | No request is in the file | Refuse | > **Synthetic case.** The publisher of donate-form is not named. ### Errors and limits Do not invent an address so that the Boolean looks like a fetch. ### Apply - **EX062 — Literal true.** A classmate says the first tick is there because the script opened the official plugin page and saved the address. What does the dictionary store for that key? *Rubric:* 3 = the literal `True`; no URL and no request; the page remains a prose sentence; the bracket stays `[x]`;; 2 = a stored Boolean, not a fetch;; 1 = one fact;; 0 = none. ### Continue studying — lesson 16 (chapter 16 of 20) [← Chapter 15](#ch-15) · [Course chapter index](../SUBJECTS.md) · [Chapter 17 →](#ch-17) Continue to the next authored lesson. ## Worked answers **EX062.** The key stores the literal `True`. No address is stored and no request is made. The official page remains a sentence in the lesson.