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doc: expand description of parseArg's default
PR-URL: #54431 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Jordan Harband <ljharb@gmail.com>
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doc/api/util.md

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times. If `true`, all values will be collected in an array. If
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`false`, values for the option are last-wins. **Default:** `false`.
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* `short` {string} A single character alias for the option.
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* `default` {string | boolean | string\[] | boolean\[]} The default option
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value when it is not set by args. It must be of the same type as the
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`type` property. When `multiple` is `true`, it must be an array.
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* `default` {string | boolean | string\[] | boolean\[]} The default value to
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be used if (and only if) the option does not appear in the arguments to be
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parsed. It must be of the same type as the `type` property. When `multiple`
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is `true`, it must be an array.
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* `strict` {boolean} Should an error be thrown when unknown arguments
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are encountered, or when arguments are passed that do not match the
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`type` configured in `options`.

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