Fix numeric 0 stringify producing 0.0 (#4135)

.chronus/changes/fix-numeric-print-2024-7-9-16-3-25.md

@@ -0,0 +1,8 @@
+---
+# Change versionKind to one of: internal, fix, dependencies, feature, deprecation, breaking
+changeKind: fix
+packages:
+  - "@typespec/compiler"
+---
+
+Fix numeric 0 stringify producing 0.0

packages/compiler/src/core/numeric.ts

@@ -135,7 +135,9 @@ function parse(original: string): InternalData {
   return { n, e: exp, s: sign, d: decimal };
 }
 
-function stringify(value: InternalData) {
+function stringify(value: InternalData): string {
+  if (value.n === 0n) return "0";
+
   const n = value.n.toString();
   const sign = value.s === -1 ? "-" : "";
   const int = value.e === 0 ? "0" : n.slice(0, value.e);

packages/compiler/test/core/numeric.test.ts

@@ -153,6 +153,13 @@ describe("parsing", () => {
 });
 
 describe("asString", () => {
+  it("0 is 0", () => {
+    expect(Numeric("0.0").toString()).toEqual("0");
+  });
+  it("1.0 is 1", () => {
+    expect(Numeric("1.0").toString()).toEqual("1");
+  });
+
   it("doesn't include decimal if is an integer", () => {
     expect(Numeric("123").toString()).toEqual("123");
   });