[5.5] Default value to true in session's Store::flash

[sebastiandedeyne]

This would be useful for cases in which you don't care about the actual contents of the flash message. Looks cleaner that assigning an arbitrary value like true, 'success' or 1.

E.g. if you want to display a notification if settings have been saved, and do nothing otherwise.

session()->flash('settings:saved')

@if(session()->has('settings:saved'))
    <div class="alert">Saved!</div>
@endif

[balping]

The default should be null then. session()->has() would still give true.