toml string with space will cause segfault

[CNOCTAVE]

Example toml string:
[a]\n name = "A"\n [a.b]\n name = "B"\n [a.b.c]\n name = "C"\n [a.b.c.d]\n name = "D"

If change string to:
[a]\nname="A"\n[a.b]\nname="B"\n[a.b.c]\nname="C"\n[a.b.c.d]\nname="D"
Then toml11 won't cause segfault.