The function did not only validate the mode but it returns a new
value depending on the input. Thus `validate` did not seem to be an
appropriate name.

PR-URL: nodejs#26809
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

This makes sure the validation functions do not cause any side
effects. Validation functions should ideally only validate the input
without any other effect. Since the input value must be known from
the callee, there is no reason to return the input value.

PR-URL: nodejs#26809
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

The function did not only validate the timer but it caused side
effects like a warning and potentially returned a different value
than the input value. Thus the name `validate` did not seem to be
appropriate.

PR-URL: nodejs#26809
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

The name indicated only validation while it did much more and it
returned a different value to the callee function. The underscore
was also not necessary as the function is internal one way or the
other.

PR-URL: nodejs#26809
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

The function did not only validate the input so far but it also made
a copy of the input object and returned that copy to the callee
function. That copy was not necessary for all call sites and it was
not obvious that the function did not only validate the input but
that it also returned a copy of it. This makes sure the function does
nothing more than validation and copying is happening in the callee
function when required.

PR-URL: nodejs#26809
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

This function did not only validate the input but it returned a new
value in case the hostname was valid. This simplifies the function
by always returning the required value, no matter if it is valid or
invalid, so the callee site does not have to check that anymore. On
top the function is renamed to `getHostname` to make clear that the
function does not only validate the input but it also returns a new
value.

PR-URL: nodejs#26809
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

The function does not only validate the input but it causes side
effects by adding default options to the input object in case the
option is not set.

PR-URL: nodejs#26809
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

This renames the parameters for clarity and removes the check for
undefined encoding. That will always default to `utf8`.

PR-URL: nodejs#26809
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

There are lots of places that validate for arrayBufferView and we
have multiple functions that do the same thing. Instead, move the
validation into `internal/validators` so all files can use that
instead.

There are more functions throughout the code that do the same but
it takes some more work to fully consolidate all of those.

PR-URL: nodejs#26809
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>