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

The repository tests several important edge cases:

Negative numbers: Negative values are supported and formatted with a leading minus sign. Tests include [test.js:L56-L62]:

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

The code also handles negative numbers with the signed option and fixedWidth [test.js:L328]:

• prettyBytes(-1337, {fixedWidth: 8}) → '-1.34 kB'

Invalid numeric inputs (throws errors): The function validates input strictly [test.js:L3-L27]:

• prettyBytes(Number.NaN) - throws TypeError
• prettyBytes(Number.POSITIVE_INFINITY) - throws TypeError
• prettyBytes(Number.NEGATIVE_INFINITY) - throws TypeError

The validation logic is in [index.js:L125-L127], which checks:

if (typeof number !== 'bigint' && !Number.isFinite(number)) {
    throw new TypeError(`Expected a finite number, got ${typeof number}: ${number}`);
}

Invalid fixedWidth values (throws errors) [test.js:L32-L40, L309-L325]:

• Negative values: fixedWidth: -1 or fixedWidth: -5
• Non-integers: fixedWidth: 1.5 or fixedWidth: 3.5
• Non-numbers: fixedWidth: '10' (string)
• Special numbers: NaN, Infinity
• Values exceeding safe integer bounds

The validation enforces that fixedWidth must be a non-negative safe integer [index.js:L99-L101].

FOLLOW_UPS:

• How does the signed option handle zero values?
• What units does pretty-bytes support beyond bytes?
• How does binary mode differ from standard SI mode?