Add support for floating points ending in .0 (#10) (#316)

Add support for floating points ending in .0 in Python implementation.

The current behavior just converts them into an integer.

---------

Co-authored-by: Steve Rice <steve@steverice.org>

Author: mauriciogardini

.chronus/changes/feature-float-zero-support-2025-9-8-19-16-52.md

@@ -0,0 +1,7 @@
+---
+changeKind: fix
+packages:
+  - "@alloy-js/python"
+---
+
+Add support for floats that end in .0

packages/python/src/components/Atom.tsx

@@ -2,6 +2,7 @@ import { For, Indent, memo } from "@alloy-js/core";
 
 export interface AtomProps {
   jsValue?: unknown;
+  asFloat?: boolean;
 }
 
 /**
@@ -25,6 +26,9 @@ export function Atom(props: AtomProps): any {
     if (typeof jsValue === "undefined") {
       return "None";
     } else if (typeof jsValue === "number") {
+      if (props.asFloat && Number.isInteger(jsValue)) {
+        return jsValue.toFixed(1);
+      }
       return String(jsValue);
     } else if (typeof jsValue === "boolean") {
       return jsValue ? "True" : "False";

packages/python/test/values.test.tsx

@@ -15,6 +15,40 @@ describe("Atom", () => {
     expect(toSourceText([<py.Atom jsValue={123} />])).toRenderTo("123");
   });
 
+  it("renders floating point number", () => {
+    expect(toSourceText([<py.Atom jsValue={123.456} />])).toRenderTo("123.456");
+  });
+
+  it("renders floating point number when hinted", () => {
+    expect(toSourceText([<py.Atom jsValue={123.456} asFloat />])).toRenderTo(
+      "123.456",
+    );
+  });
+
+  it("renders floating point number with decimal point zero when hinted", () => {
+    expect(toSourceText([<py.Atom jsValue={123.0} asFloat />])).toRenderTo(
+      "123.0",
+    );
+  });
+
+  it("renders integer as float when hinted", () => {
+    expect(toSourceText([<py.Atom jsValue={123} asFloat />])).toRenderTo(
+      "123.0",
+    );
+  });
+
+  it("renders small positive float when hinted", () => {
+    expect(toSourceText([<py.Atom jsValue={0.07} asFloat />])).toRenderTo(
+      "0.07",
+    );
+  });
+
+  it("renders large positive numbers as float when hinted", () => {
+    expect(toSourceText([<py.Atom jsValue={2 ** 64} asFloat />])).toRenderTo(
+      "18446744073709551616.0",
+    );
+  });
+
   it("renders boolean - True", () => {
     expect(toSourceText([<py.Atom jsValue={true} />])).toRenderTo("True");
   });