feat(config)!: default branchNameStrict=true

docs/usage/configuration-options.md

@@ -299,15 +299,15 @@ If you truly need to configure this then it probably means either:
 
 ## branchNameStrict
 
-By default, Renovate doesn't care about special characters when slugifying the branch name.
-This means that special characters like `.` may end up in the branch name.
-
-When you set `branchNameStrict` to `true`:
+By default, Renovate removes special characters when slugifying the branch name:
 
 - all special characters are removed
 - only alphabetic characters are allowed
 - hyphens `-` are used to separate sections
 
+To revert this behavior to that used in v32 and before, set this value to `false`.
+This will mean that special characters like `.` may end up in the branch name.
+
 ## branchPrefix
 
 You can modify this field if you want to change the prefix used.

lib/config/options/index.ts

@@ -2412,7 +2412,7 @@ const options: RenovateOptions[] = [
     name: 'branchNameStrict',
     description: `Whether to be strict about the use of special characters within the branch name.`,
     type: 'boolean',
-    default: false,
+    default: true,
   },
 ];