The python testcase decodes to: ``` 00000000 35 63 6f 6e 88 2c 29 33 2c 2c 2c 2c 63 6f 6e 88 |5con.,)3,,,,con.| 00000010 2c 2a 2c 3a 35 63 6f 6e 2c |,*,:5con,| ``` which triggers: ``` Assertion failed: ((uint32_t)0 < (&reduction.slices)->size), function parser__advance, file src/runtime/parser.c, line 1202. ```