Bug in @LEN Function?

I'm using the @LEN function to get the length of a string. However, when that string contains special escaped characters, such as ^s, the length is wrong. Both the caret and the s are counted as separate characters. The same thing happens with strings enclosed by back-quotes. The back-quote characters are counted.

TCC(30.00.22): C:\>echo %@len[1234]
4

TCC(30.00.22): C:\>echo %@len[^s1234^s]
8

TCC(30.00.22): C:\>echo %@len[`12%34`]
7

TCC(30.00.22): C:\>echo `12%34`
12%34

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