Use strict equality in formulas

Author: jstrieb

src/formula.js

@@ -82,9 +82,8 @@ class BinaryOperation extends Expression {
     "**": Math.pow,
 
     // Logical
-    "!=": (x, y) => x != y,
-    // TODO: Should this use triple equals?
-    "==": (x, y) => x == y,
+    "!=": (x, y) => x !== y,
+    "==": (x, y) => x === y,
     ">=": (x, y) => x >= y,
     ">": (x, y) => x > y,
     "<=": (x, y) => x <= y,

test/sheet-and-formula.test.js

@@ -374,3 +374,8 @@ test("Cells with empty formula have undefined value", async () => {
   state.currentSheet.cells[0][1].formula = "";
   await expectSheet(state.currentSheet, [[undefined, undefined]]);
 });
+
+test("Formulas use strict equality", async () => {
+  const state = createSheet([[`=10 == "10"`, `="1" != 1`]]);
+  await expectSheet(state.currentSheet, [[false, true]]);
+});