Remove more dead code

Also, fix a typo in an error message

Author: jessealama

src/decimal128.mts

@@ -675,7 +675,7 @@ function handleDecimalNotation(
     }
 
     if ("-." === withoutUnderscores) {
-        throw new SyntaxError("Lone minus sign and period anot permitted");
+        throw new SyntaxError("Lone minus sign and period not permitted");
     }
 
     let isNegative = !!withoutUnderscores.match(/^-/);
@@ -895,18 +895,6 @@ const DEFAULT_TOSTRING_OPTIONS: FullySpecifiedToStringOptions = Object.freeze({
     normalize: true,
 });
 
-interface CmpOptions {
-    normalize?: boolean;
-}
-
-interface FullySpecifiedCmpOptions {
-    total: boolean;
-}
-
-const DEFAULT_CMP_OPTIONS: FullySpecifiedCmpOptions = Object.freeze({
-    total: false, // compare by numeric value (ignore trailing zeroes, treat NaN as not-a-number, for a change)
-});
-
 function ensureFullySpecifiedConstructorOptions(
     options?: ConstructorOptions
 ): FullySpecifiedConstructorOptions {