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

category: numbers
subcategory: precision
tier: T1

bugs_caught:
  - "Floating point comparison failures"
  - "Rounding errors in calculations"
  - "Currency calculation bugs"

values:
  classic_float_fail:
    expression: "0.1 + 0.2"
    expected: 0.3
    actual: 0.30000000000000004
    bugs_caught:
      - "Direct float comparison"
      - "Classic IEEE 754 demonstration"
    safe_for_automation: true

  float_subtraction:
    expression: "0.3 - 0.1"
    expected: 0.2
    actual: 0.19999999999999998
    bugs_caught:
      - "Float subtraction precision"
    safe_for_automation: true

  currency_penny:
    value: 0.01
    bugs_caught:
      - "Currency precision (use integers for cents)"
    safe_for_automation: true

  currency_calculation:
    expression: "19.99 * 100"
    expected: 1999
    actual: 1998.9999999999998
    bugs_caught:
      - "Currency multiplication precision"
    safe_for_automation: true

  very_small:
    value: 1e-300
    bugs_caught:
      - "Very small number handling"
      - "Underflow risks"
    safe_for_automation: true

  very_large:
    value: 1e300
    bugs_caught:
      - "Very large number handling"
      - "Overflow risks"
    safe_for_automation: true

  recurring_decimal:
    expression: "1 / 3"
    bugs_caught:
      - "Repeating decimal representation"
    safe_for_automation: true

  division_precision:
    expression: "10 / 3 * 3"
    expected: 10
    actual: 9.999999999999998
    bugs_caught:
      - "Division-multiplication precision loss"
    safe_for_automation: true

  sum_many_small:
    expression: "0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1"
    expected: 1.0
    actual: 0.9999999999999999
    bugs_caught:
      - "Accumulated rounding errors"
    safe_for_automation: true

  percentage_of_percentage:
    expression: "100 * 0.7 * 0.7"
    expected: 49
    actual: 48.99999999999999
    bugs_caught:
      - "Compound percentage calculations"
    safe_for_automation: true