ZONE_TAPE_SIZE
struct { const char **head, **tail, *tape[ZONE_TAPE_SIZE + 2]; } fields;
struct { const char **head, **tail, *tape[ZONE_TAPE_SIZE + 1]; } delimiters;
struct { uint16_t *head, *tail, tape[ZONE_TAPE_SIZE + 1]; } newlines;
const char **tape_limit = parser->file->fields.tape + ZONE_TAPE_SIZE;
const char **tape_limit = parser->file->fields.tape + ZONE_TAPE_SIZE;