facebook / facebook/zstd

Zstd doesn't always create RLE blocks

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Description

```
cat <(head -c 1GB /dev/zero) <(echo Hello world) <(head -c 1GB /dev/zero) > file
zstd file
```

There is a small percent of blocks that aren't emitted as RLE blocks, and instead are emitted as a block with a single sequence.

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