diff --git a/crates/uplc/src/machine/runtime.rs b/crates/uplc/src/machine/runtime.rs
index bb4f44c4..124212a8 100644
--- a/crates/uplc/src/machine/runtime.rs
+++ b/crates/uplc/src/machine/runtime.rs
@@ -33,12 +33,6 @@ const BLST_P2_COMPRESSED_SIZE: usize = 96;
 
 pub const INTEGER_TO_BYTE_STRING_MAXIMUM_OUTPUT_LENGTH: i64 = 8192;
 
-//#[derive(std::cmp::PartialEq)]
-//pub enum EvalMode {
-//    Immediate,
-//    Deferred,
-//}
-
 pub enum BuiltinSemantics {
     V1,
     V2,
@@ -1384,17 +1378,12 @@ impl DefaultFunction {
                 let size = args[1].unwrap_integer()?;
                 let input = args[2].unwrap_integer()?;
 
-                // Since this is checked at cost time it is no longer needed
-                // if size.is_negative() {
-                //     return Err(Error::IntegerToByteStringNegativeSize(size.clone()));
-                // }
-
-                // if size > &INTEGER_TO_BYTE_STRING_MAXIMUM_OUTPUT_LENGTH.into() {
-                //     return Err(Error::IntegerToByteStringSizeTooBig(
-                //         size.clone(),
-                //         INTEGER_TO_BYTE_STRING_MAXIMUM_OUTPUT_LENGTH,
-                //     ));
-                // }
+                // NOTE:
+                // We ought to also check for negative size and too large sizes. These checks
+                // however happens prior to calling the builtin as part of the costing step. So by
+                // the time we reach this builtin call, the size can be assumed to be
+                //
+                // >= 0 && < INTEGER_TO_BYTE_STRING_MAXIMUM_OUTPUT_LENGTH
 
                 if size.is_zero()
                     && integer_log2(input.clone())