Fix countsame when match extends to last byte

Author: tecosaur

src/lexer.jl

@@ -910,7 +910,7 @@ function countsame(bytes::DenseVector{UInt8}, pos::I, char::Char; limit::I = len
     for p in pos:limit
         bytes[p] != uchar && return p - pos
     end
-    limit + 0x1
+    limit - pos + 0x1
 end
 
 function nextchar(bytes::DenseVector{UInt8}, pos::I, char::UInt8; limit::I = length(bytes) % I)::I where {I <: Integer}