--- FAIL: TestEncDatumSize (0.00s)
    encoded_datum_test.go:656: on {0 [] 1.23E+4}        received 104, expected 136
    encoded_datum_test.go:656: on {0 [44 3 46 0] 1.23E+4}       received 108, expected 140
    encoded_datum_test.go:668: on [{0 [136] <nil>} {1 [135 132] <nil>} {0 [247 48 57] <nil>} {0 [] 123} {0 [246 123] 123} {0 [4] <nil>} {1 [3 63 161 63 255 255 255 255 255] <nil>} {0 [] 123.0} {0 [5 64 94 192 0 0 0 0 0] 123.0} {0 [39] <nil>} {1 [34 252 209 0] <nil>} {0 [] 1.23E+4} {0 [44 3 46 0] 1.23E+4} {0 [18 0 1] <nil>} {1 [19 206 205 204
 29 115 103 255 254] <nil>} {0 [] '12'} {0 [18 49 50 51 52 0 1] '12345'} {0 [20 249 91 50 40 104 136] <nil>} {0 [20 249 91 50 40 116 248 52 191 21] <nil>}]     received 1191, expected 1255