Merge branch '4.0'

* 4.0:
  Fix tests
  PropertyInfo\DoctrineExtractor - There is bug when indexBy is meta key
  Fix PercentType error rendering.
  [minor] SCA
  [Cache] Inline some hot function calls
  fixed Silex project's URL
  fixed deprecations in tests
  fixed Twig URL
  [Cache] Add missing `@internal` tag on ProxyTrait
  fix formatting arguments in plaintext format
  Fix PSR exception context key
  Don't assume that file binary exists on *nix OS
  Fix that ESI/SSI processing can turn a \"private\" response \"public\"
  [Form] Fixed trimming choice values
  fix rendering exception stack traces
  [Routing] Fix loading multiple class annotations for invokable classes

Author: nicolas-grekas

README.md

@@ -1,7 +1,7 @@
 Twig Bridge
 ===========
 
-Provides integration for [Twig](http://twig.sensiolabs.org/) with various
+Provides integration for [Twig](https://twig.symfony.com/) with various
 Symfony components.
 
 Resources

Resources/views/Form/bootstrap_4_layout.html.twig

@@ -106,8 +106,7 @@
 {%- endblock dateinterval_widget %}
 
 {% block percent_widget -%}
-    <div class="input-group{{ not valid ? ' form-control is-invalid' }}">
-        {% set valid = true %}
+    <div class="input-group">
         {{- block('form_widget_simple') -}}
         <div class="input-group-append">
             <span class="input-group-text">%</span>