Interesting cases to be covered in test262

[gibson042]

This issue exists to collect test cases for eventual propagation into test262.

• converting 5 inches to feet should produce a result with a numeric value exactly equal to 5 * (1/12) (0.41666666666666663) (Add baby CAS unit conversion #89 (comment) )
• converting 18 inches to feet should produce a result of exactly 1.5 (Add baby CAS unit conversion #89 (comment) )
• converting 100°C to Fahrenheit should produce a result of exactly 212 (Add baby CAS unit conversion #89 (review) )
• converting 80063993375475600°C to Fahrenheit exposes inner details of Number conversion and arithmetic—using mathematical value arithmetic with a single final conversion to Number produces 144115188075856128_𝔽¹, while converting operands to Numbers and then using IEEE 754 operations produces 144115188075856096_𝔽² (Add baby CAS unit conversion #89 (review) )

Footnotes

1. 𝔽(80063993375475600 × (1 ÷ 5⁄9) + (273.15 − 2298.35÷9)÷5⁄9) = 𝔽(144115188075856112) = 144115188075856128_𝔽 ↩

2. 𝔽(80063993375475600) * 𝔽(1 ÷ 5⁄9) + 𝔽(273.15 − 2298.35÷9)÷5⁄9) = 𝔽(80063993375475600) * 𝔽(1.8) + 𝔽(32) = 𝔽(144115188075856080) + 𝔽(32) = 𝔽(144115188075856064) + 𝔽(32) = 144115188075856096_𝔽 ↩

[sffc]

FYI:

80063993375475600 * (9 / 5) + 32
// 144115188075856130
80063993375475600 * 9 / 5 + 32
// 144115188075856100
80063993375475600n * 9n / 5n + 32n
// 144115188075856112n

(144115188075856130).toFixed(0)
// '144115188075856128'
(144115188075856100).toFixed(0)
// '144115188075856096'
(144115188075856112).toFixed(0)
// '144115188075856128'

I'm not reproducing 144115188075856064_𝔽

[gibson042]

Thanks, bad copypasta on my part. Fixed.