docs: add example of implementing optional-value · pkgjs/parseargs@b4e25c0

The job was canceled because "_16" failed.

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Missing space before value for key 'short'

'args' is never reassigned. Use 'const' instead

Missing space before value for key 'strict'

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'&&' should be placed at the end of the line

'&&' should be placed at the end of the line

'&&' should be placed at the end of the line

This line has a length of 91. Maximum allowed is 80

'&&' should be placed at the end of the line

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