What edge cases (negative, NaN, Infinity) are tested?

The repository tests several important edge cases for invalid and special numeric inputs:

Invalid inputs that throw errors [test.js:L1-L40]:

• Empty strings and string values ('', '1')
• Number.NaN
• Boolean values (true)
• Number.POSITIVE_INFINITY
• Number.NEGATIVE_INFINITY
• null

Negative number support [test.js:L56-L62]: The library supports negative numbers and converts them correctly:

• prettyBytes(-0.4) → '-0.4 B'
• prettyBytes(-999) → '-999 B'
• prettyBytes(-1001) → '-1 kB'
• prettyBytes(-1001n) → '-1 kB' (with BigInt)

Edge cases with fixedWidth and signed options [test.js:L281-L340]:

• Signed zero: prettyBytes(0, {fixedWidth: 8, signed: true}) → ' 0 B' (space instead of + for alignment)
• Negative numbers with fixedWidth: prettyBytes(-1337, {fixedWidth: 8}) → '-1.34 kB'
• Very small decimals: prettyBytes(0.5, {fixedWidth: 8}) → ' 0.5 B'

Input validation for fixedWidth [test.js:L303-L320]:

• Negative values throw: fixedWidth: -5
• Non-integer values throw: fixedWidth: 3.5
• Number.POSITIVE_INFINITY throws
• Number.NaN throws
• String values throw: fixedWidth: '10'
• Values exceeding Number.MAX_SAFE_INTEGER throw

The main validation logic is in [index.js:L124-L127], which ensures the input is a finite number or BigInt.

FOLLOW_UPS:

• How does the signed option affect output formatting?
• What locales are supported for output?
• How does the binary option differ from default behavior?