+ * Functions to check passwords against a policy requirement.
+ *
+ * $policyVal is the value configured in $wgPasswordPolicy. If the return status is fatal,
+ * the user won't be allowed to login. If the status is not good but not fatal, the user
+ * will not be allowed to set the given password (on registration or password change),
+ * but can still log in after bypassing a warning.
+ *