howto

The finished project does not work on my machine (Debian 10). After entering mix phx.server I was prompted to install rebar3, which I did. Entering mix phx.server gets me this error:

function :crypto.hmac/3 is undefined or private 

The "!" is shown in the section below:

`When Boolean is called with argument value, the following steps are taken:

Let b be ! ToBoolean(value).

If NewTarget is undefined, return b.

Let O be ? OrdinaryCreateFromConstructor(NewTarget, "%BooleanPrototype%", « [[BooleanData]] »).

Set O.[[BooleanData]] to b.

Return O.`

I am not a native English speaker :)
If you see some mistake or some misspelling in one of markdown doc, please, smile and submit a PR ;)

Markdown files are in the content directory, in main branch:
https://github.com/roberto-butti/50-drops-of-php/tree/main/content

It would be appreciated