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doc: add info about serializable types
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querystring.stringify() doesn't serialize some values.
Explicitly mention what values are serialized in the docs.
Add what happens when another data type is passed to
`querystring.stringify()` besides the ones that can be correctly parsed

PR-URL: #12313
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
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shubheksha authored and MylesBorins committed May 18, 2017
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4 changes: 4 additions & 0 deletions doc/api/querystring.md
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Expand Up @@ -91,6 +91,10 @@ added: v0.1.25
The `querystring.stringify()` method produces a URL query string from a
given `obj` by iterating through the object's "own properties".

It serializes the following types of values passed in `obj`:
{string|number|boolean|string[]|number[]|boolean[]}
Any other input values will be coerced to empty strings.

For example:

```js
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