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

Based on the test file, here are the edge cases tested for invalid inputs:

Invalid Input Types and Values [test.js:L1-L35]:

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

Negative Numbers: Negative numbers are actually valid inputs. The signed option tests show that negative numbers work correctly:

• [test.js:L128-L131]: prettyBytes(-13, {signed: true}) returns '-13 B'
• [test.js:L331]: prettyBytes(-1337, {fixedWidth: 8}) returns '-1.34 kB'

Special Cases with Zero:

• [test.js:L132]: When signed: true and the input is exactly 0, it returns ' 0 B' (space instead of + for alignment)
• [test.js:L280]: prettyBytes(0, {fixedWidth: 8, signed: true}) returns ' 0 B'
• [test.js:L252]: prettyBytes(0, {signed: true, nonBreakingSpace: true}) returns ' 0\u00A0B'

Invalid fixedWidth Values [test.js:L32-L35, L309-L325]:

• Negative values: fixedWidth: -1 and fixedWidth: -5
• Non-integer values: fixedWidth: 1.5 and fixedWidth: 3.5
• Non-number types: fixedWidth: '10' (string)
• Special numbers: Number.POSITIVE_INFINITY, Number.NaN
• Values exceeding safe integer range: Number.MAX_SAFE_INTEGER + 1

FOLLOW_UPS:

• How does the signed option work with zero?
• What input types does prettyBytes accept?
• Are there locale-specific edge cases tested?