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

The repository tests several edge cases for invalid and boundary inputs:

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

• Empty strings and non-numeric strings
• Number.NaN
• Booleans (true)
• Number.POSITIVE_INFINITY and Number.NEGATIVE_INFINITY
• null
• Invalid fixedWidth values (negative numbers, non-integers, non-numeric types)

Negative numbers [test.js:L59-L66]: The function supports negative numbers and formats them with a minus sign:

• prettyBytes(-0.4) → '-0.4 B'
• prettyBytes(-10.1) → '-10.1 B'
• prettyBytes(-1001) → '-1 kB'
• Works with both regular numbers and bigint

Special zero handling with signed option [test.js:L281]: When using the signed option with zero, a space character is prepended instead of a plus sign for alignment:

• prettyBytes(0, {fixedWidth: 8, signed: true}) → ' 0 B'
• prettyBytes(0, {signed: true, nonBreakingSpace: true}) → ' 0\u00A0B'

Invalid fixedWidth cases [test.js:L316-L340]:

• Negative numbers: fixedWidth: -5
• Infinity and NaN
• Fractional numbers: fixedWidth: 3.5
• Wrong types: fixedWidth: '10' (string instead of number)
• Values exceeding Number.MAX_SAFE_INTEGER

FOLLOW_UPS:

• How does the function handle very large numbers?
• What localization options does the library support?
• How does the fixedWidth padding alignment work?