[5.4] Corrected the optimistic setting of a value to a unknown type

[freestream]

When calling withErrors it assumes that any existing value in the session storage with key errors is of the correct data type. Due to errors is not a reserved key its very easy to get a BadMethodCallException exception.

For example

$request->session()->put('errors', []);

$this->validate($request, [
    'name'  => 'required',
]);

This would trigger the following stack trace.

BadMethodCallException in RedirectResponse.php line 136:
Call to a member function put() on a non-object (array)

[vlakoff]

With PRs merged like this one, I see the commits twice in my Git visual history. Once from the 5.4 branch, once from the contributor's branch. This adds a bit of clutter.

Previously I only had the commits from the contributor's branch, and of course the merge commit.

Are you trying a different method for merging?