Only check parser position update if a cell or row is complete

Sources/CSV/Parser.swift

@@ -153,13 +153,14 @@ public struct Parser {
                         catch let error { errors.errors.append(error) }
                         self.state.headerIndex += 1
                     }
+
                     currentCell = []
                     slice = (index + 1, index + 1)
+                    if updateState { self.state.position = .cells }
                 }
             default: slice.end += 1
             }
 
-            if updateState { self.state.position = .cells }
             index += 1
         }
 

Tests/CSVTests/ParserTests.swift

@@ -102,7 +102,7 @@ final class ParserTests: XCTestCase {
         let chnks = chunks.map { Array($0.utf8) }
         let length = chnks.reduce(0) { $0 + $1.count }
 
-        // 1.215
+        // 1.198
         measure {
             for _ in 0..<100_000 {
                 chnks.forEach { chunk in parser.parse(chunk, length: length) }