Invalid escape sequences in strings should produce an error

[AndrewSav]

Toml spec says:

For convenience, some popular characters have a compact escape sequence.

\b         - backspace       (U+0008)
\t         - tab             (U+0009)
\n         - linefeed        (U+000A)
\f         - form feed       (U+000C)
\r         - carriage return (U+000D)
\"         - quote           (U+0022)
\\         - backslash       (U+005C)
\uXXXX     - unicode         (U+XXXX)
\UXXXXXXXX - unicode         (U+XXXXXXXX)

Any Unicode character may be escaped with the \uXXXX or \UXXXXXXXX forms.
The escape codes must be valid Unicode scalar values.

All other escape sequences not listed above are reserved and, if used, TOML
should produce an error.

If I run the followning code:

	var data = Toml.ReadString("\"\\v\"=\"hello\"");
	Console.WriteLine(data.First().Key);

I'm not getting an error. Is this a bug?