Mustache version 2.14.1 is already included, but the VERSION const
incorrectly listed 2.14.0 in the tagged Mustache release. A later
upstream commit corrected this in the library, which this now matches.
The 'mbstring.func_overload' php init setting was removed for
php80 (it was deprecated since php72). So it won't evaluate to
true ever, so the whole block can be put under php version condition.
Note that this is already fixed upsteam, for commit:
e7165a33b2
And it has been released with version 2.14.1 of the library, so, once
we upgrade to it, the fix will be incorporated.
Trying to use values of type null, bool, int, float or resource as an
array (such as $null["key"]) will now generate a notice. This does not
affect array accesses performed by list().
RFC: https://wiki.php.net/rfc/notice-for-non-valid-array-container
