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doc: revise --zero-fill-buffers text in buffer.md #32019

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doc: revise --zero-fill-buffers text in buffer.md #32019

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15 changes: 6 additions & 9 deletions doc/api/buffer.md
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Expand Up @@ -123,15 +123,12 @@ added: v5.10.0
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Node.js can be started using the `--zero-fill-buffers` command line option to
cause all newly allocated `Buffer` instances to be zero-filled upon creation by
default. Before Node.js 8.0.0, this included buffers allocated by `new
Buffer(size)`. Since Node.js 8.0.0, buffers allocated with `new` are always
zero-filled, whether this option is used or not.
[`Buffer.allocUnsafe()`][], [`Buffer.allocUnsafeSlow()`][], and `new
SlowBuffer(size)`. Use of this flag can have a significant negative impact on
performance. Use of the `--zero-fill-buffers` option is recommended only when
necessary to enforce that newly allocated `Buffer` instances cannot contain old
data that is potentially sensitive.
cause all newly-allocated `Buffer` instances to be zero-filled upon creation by
default. Without the option, buffers created with [`Buffer.allocUnsafe()`][],
[`Buffer.allocUnsafeSlow()`][], and `new SlowBuffer(size)` are not zero-filled.
Use of this flag can have a significant negative impact on performance. Use the
`--zero-fill-buffers` option only when necessary to enforce that newly allocated
`Buffer` instances cannot contain old data that is potentially sensitive.

```console
$ node --zero-fill-buffers
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