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Adding "What does _ mean?" to the FAQ #1854

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Expand Up @@ -139,6 +139,15 @@ see this [Stack Overflow answer](https://stackoverflow.com/a/1059501).

[Answer on Stack Overflow](https://stackoverflow.com/a/5159356).

### What does `_` mean?

Many things really, depending on the context.
[This answer on Stack Overflow](https://stackoverflow.com/a/8001065/4111404)
has a good summary of all the meanings it has.

Note that, even if the specific meaning is different,
according to the situation, it usually means _"anything"_.

### Can I chain or nest implicit conversions?

Not really, but you can [make it work](https://stackoverflow.com/a/5332804).
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