field mask may not contain '_'

Author: FabioBatSilva

php/ext/google/protobuf/php-upb.c

@@ -1875,8 +1875,8 @@ static upb_StringView jsondec_mask(jsondec* d, const char* buf,
     if (ch >= 'A' && ch <= 'Z') {
       *out++ = '_';
       *out++ = ch + 32;
-    } else if (ch == '_') {
-      jsondec_err(d, "field mask may not contain '_'");
+    // } else if (ch == '_') {
+    //   jsondec_err(d, "field mask may not contain '_'");
     } else {
       *out++ = ch;
     }

php/tests/field_mask_test.php

@@ -8,7 +8,7 @@
 $m1 = new FieldMask();
 $m2 = new FieldMask();
 
-$m1->setPaths(['phoneNumber', 'emailAddress']);
+$m1->setPaths(['phoneNumber', 'email_address']);
 
 $m2->mergeFromJsonString($m1->serializeToJsonString());