metadata:
  version: "1.0.0"
  last_updated: "2026-02-01"
  source_urls: []

category: booleans
subcategory: boundaries
tier: T0

bugs_caught:
  - "Null reference exceptions"
  - "Truthy/falsy confusion"
  - "Type coercion bugs"

values:
  true:
    value: true
    bugs_caught:
      - "Boolean true handling"
    safe_for_automation: true

  false:
    value: false
    bugs_caught:
      - "Boolean false handling"
      - "Falsy but valid distinction"
    safe_for_automation: true

  null:
    value: null
    bugs_caught:
      - "Null reference exceptions"
      - "null vs undefined"
      - "Optional chaining need"
    safe_for_automation: true

  undefined:
    value: "undefined"
    bugs_caught:
      - "Undefined variable access"
      - "Missing property handling"
    safe_for_automation: true
    note: "JavaScript-specific"

  # Truthy values that aren't true
  truthy_string:
    value: "false"
    bugs_caught:
      - "String 'false' is truthy"
      - "Boolean string parsing"
    safe_for_automation: true

  truthy_zero_string:
    value: "0"
    bugs_caught:
      - "String '0' is truthy"
    safe_for_automation: true

  truthy_empty_array:
    value: []
    bugs_caught:
      - "Empty array is truthy (JavaScript)"
      - "Array length check needed"
    safe_for_automation: true
    note: "JavaScript: [] is truthy, Python: [] is falsy"

  truthy_empty_object:
    value: {}
    bugs_caught:
      - "Empty object is truthy"
      - "Object.keys check needed"
    safe_for_automation: true

  # Falsy values that aren't false
  falsy_zero:
    value: 0
    bugs_caught:
      - "Zero is falsy but valid"
      - "0 vs null confusion"
    safe_for_automation: true

  falsy_empty_string:
    value: ""
    bugs_caught:
      - "Empty string is falsy"
      - "'' vs null confusion"
    safe_for_automation: true

  falsy_nan:
    value: "NaN"
    bugs_caught:
      - "NaN is falsy"
    safe_for_automation: true

  # Boolean-like strings
  bool_string_true:
    value: "true"
    bugs_caught:
      - "Boolean string parsing"
    safe_for_automation: true

  bool_string_True:
    value: "True"
    bugs_caught:
      - "Case-sensitive boolean parsing"
    safe_for_automation: true

  bool_string_TRUE:
    value: "TRUE"
    bugs_caught:
      - "Uppercase boolean parsing"
    safe_for_automation: true

  bool_string_yes:
    value: "yes"
    bugs_caught:
      - "YAML-style boolean"
    safe_for_automation: true

  bool_string_on:
    value: "on"
    bugs_caught:
      - "Form checkbox value"
    safe_for_automation: true

  bool_string_1:
    value: "1"
    bugs_caught:
      - "Numeric boolean"
    safe_for_automation: true

  bool_number_1:
    value: 1
    bugs_caught:
      - "Number 1 as boolean"
    safe_for_automation: true

  bool_number_2:
    value: 2
    bugs_caught:
      - "Non-zero non-one number"
      - "Truthy but not === true"
    safe_for_automation: true