fail at field type mismatch in json2pb #1640

Job	Run time
clang-compile-with-cmake	2m 57s
clang-compile-with-bazel	15m 51s
clang-compile-with-bazel-all-options	16m 44s
clang-compile-with-boringssl	17m 7s
clang-compile-with-cmake-all-options	5m 30s
clang-compile-with-make	2m 58s
clang-compile-with-make-all-options	5m 19s
clang-unittest	16m 55s
gcc-compile-with-bazel	17m 11s
gcc-compile-with-bazel-all-options	18m 35s
gcc-compile-with-boringssl	17m 40s
gcc-compile-with-cmake	3m 16s
gcc-compile-with-cmake-all-options	5m 23s
gcc-compile-with-make	2m 56s
gcc-compile-with-make-all-options	4m 57s
	2h 33m 19s

Provide feedback