In version 3.15.0, when accessing SplObjectStorage by index (object), an error is generated

[maninhat]

{% for q in sections[s] %}

where section is SplObjectStorage
and s is a object
Raise error An exception has been thrown during the rendering of a template ("Object of class App\Attempt\Section could not be converted to string").

[fabpot]

The error seems legit if your Section does not implement Stringable/__toString().
If it used to work before, please can you provide a small reproducer (as I cannot reproduce something that worked before 3.15.0 and broken after)?

[gharlan]

The reason is this change: #4425 (comment)