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Add note about sdsnewlen(0, ...) to readme #137

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3 changes: 3 additions & 0 deletions README.md
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Expand Up @@ -171,6 +171,9 @@ There are many ways to create SDS strings:
Note: `sdslen` return value is casted to `int` because it returns a `size_t`
type. You can use the right `printf` specifier instead of casting.

Note: If the first argument to `sdsnewlen` is `0`, it will zero-initialize the
string's memory. This way you can create an empty buffer of a certain length.

* The `sdsempty()` function creates an empty zero-length string:

```c
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