`nf` seems to have wrong prototypes

[IronBlood]

Most appropriate sub-area of p5.js?

• Accessibility
• Color
• Core/Environment/Rendering
• Data
• DOM
• Events
• Image
• IO
• Math
• Typography
• Utilities
• WebGL
• Build process
• Unit testing
• Internationalization
• Friendly errors
• Other (specify if possible)

p5.js version

main branch

Web browser and version

No response

Operating system

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Steps to reproduce this

This is generally a report about the documentation and test cases.

From the reference, the prototypes for nf are:

• nf(num, [left], [right])
• nf(nums, [left], [right])

However, from the source code, especially in doNf(num, left, right), there isn't check of type left === 'undefined', nor a default value for left, so when calling leftPart = leftPart.padStart(left, '0'), left cannot be undefined.

Also in the test suite of p5.prototype.nf, test cases are missing:

• result = nf(1234), if left is optional
• result = nf([1234, 3.141516, 3.141516e-2], 2) for an array of numbers to format

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