Unmarshalling for floats and strings, but strings crashes after multiple invocations

src/runtime/javascript/tests/basic.test.ts

@@ -209,7 +209,7 @@ describe('abstract syntax', () => {
 
 // ----------------------------------------------------------------------------
 
-describe('expressions', () => {
+describe.only('expressions', () => {
   test('small integer', () => {
     const e1 = PGF.readExpr('123')
     const e2 = new PGF.ExprLit(123)
@@ -253,4 +253,36 @@ describe('expressions', () => {
     expect(e1).toEqual(e2)
     expect(e1).not.toEqual(e3)
   })
+
+  test('float', () => {
+    const e1 = PGF.readExpr('3.142')
+    const e2 = new PGF.ExprLit(3.142)
+    const e3 = new PGF.ExprLit(2.014)
+    expect(e1).toEqual(e2)
+    expect(e1).not.toEqual(e3)
+  })
+
+  test('negative float', () => {
+    const e1 = PGF.readExpr('-3.142')
+    const e2 = new PGF.ExprLit(-3.142)
+    const e3 = new PGF.ExprLit(-2.014)
+    expect(e1).toEqual(e2)
+    expect(e1).not.toEqual(e3)
+  })
+
+  test('string', () => {
+    const e1 = PGF.readExpr('"abc"')
+    const e2 = new PGF.ExprLit('abc')
+    const e3 = new PGF.ExprLit('def')
+    expect(e1).toEqual(e2)
+    expect(e1).not.toEqual(e3)
+  })
+
+  test('string unicode', () => {
+    const e1 = PGF.readExpr('"açġħ"')
+    const e2 = new PGF.ExprLit('açġħ')
+    const e3 = new PGF.ExprLit('acgh')
+    expect(e1).toEqual(e2)
+    expect(e1).not.toEqual(e3)
+  })
 })