making some good progress

src/util/parse.ts

@@ -0,0 +1,21 @@
+
+// Helpers...
+export function parseDouble(text: string): number | undefined {
+  if (text === '') {
+    return;
+  }
+  const num = Number(text);
+  if (Number.isNaN(num)) {
+    return;
+  }
+  return num;
+}
+export function parseInt(text: string): bigint | undefined {
+  if (text === '') {
+    return;
+  }
+  try {
+    return BigInt(text);
+  }
+  catch (e) { };
+}