diff --git a/src/pitch_interval.cpp b/src/pitch_interval.cpp
index 0be8fe9..dc803a3 100644
--- a/src/pitch_interval.cpp
+++ b/src/pitch_interval.cpp
@@ -43,8 +43,8 @@ std::string intervalFillStr(const std::string& s, int n) {
 static std::unordered_map<std::string, Interval> intervalCache;
 
 // Arrays and constants - match TypeScript implementation
-const std::vector<int> SIZES = {0, 2, 4, 5, 7, 9, 11};
-const std::string TYPES = "PMMPPMM";
+const std::array<int,7> SIZES = {0, 2, 4, 5, 7, 9, 11};
+constexpr std::array<char, 7> TYPES = { 'P','M','M','P','P','M','M' };
 
 // Define NoInterval - exactly like in TypeScript
 const Interval NoInterval = Interval();
@@ -246,17 +246,17 @@ Interval interval(const std::string& src, bool useCache) {
     }
     
     // Check cache first
-    if (useCache && intervalCache.find(src) != intervalCache.end()) {
-        return intervalCache[src];
-    }
+    // if (useCache && intervalCache.find(src) != intervalCache.end()) {
+    //     return intervalCache[src];
+    // }
     
     // Parse string - using renamed function
     auto result = parseInterval(src);
     
     // Cache result if valid
-    if (useCache && !result.empty) {
-        intervalCache[src] = result;
-    }
+    // if (useCache && !result.empty) {
+    //     intervalCache[src] = result;
+    // }
     
     return result;
 }