Number fields drop trailing zeros: formatNumber still rounds to at most 3 decimals and then removes zeros at the end, so 100.000 reads 100 and 0.500 reads 0.5, everywhere (inspector, graph and shader nodes, duration and fps in the animation and tile tabs); a field's own decimals is now an upper limit, stored values are unchanged, -0 still shows as 0, and the graph's separate integer rule is gone (#172)

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

tests/ui/math.test.ts

@@ -31,11 +31,25 @@ describe('centreY', () => {
 });
 
 describe('formatNumber', () => {
-  it('shows three decimals by default', () => {
+  it('shows at most three decimals by default and drops trailing zeros', () => {
     expect(NUMBER_DECIMALS).toBe(3);
-    expect(formatNumber(100)).toBe('100.000');
-    expect(formatNumber(0.5)).toBe('0.500');
-    expect(formatNumber(-12)).toBe('-12.000');
+    expect(formatNumber(100)).toBe('100');
+    expect(formatNumber(0.5)).toBe('0.5');
+    expect(formatNumber(-12)).toBe('-12');
+    expect(formatNumber(9.0909)).toBe('9.091');
+    expect(formatNumber(2.1)).toBe('2.1');
+  });
+
+  it('keeps the zeros of a whole number', () => {
+    expect(formatNumber(100, 0)).toBe('100');
+    expect(formatNumber(1000)).toBe('1000');
+    expect(formatNumber(-50, 2)).toBe('-50');
+  });
+
+  it('drops the whole fraction once rounding leaves only zeros', () => {
+    expect(formatNumber(2.0004)).toBe('2');
+    expect(formatNumber(1.9996)).toBe('2');
+    expect(formatNumber(0.10004)).toBe('0.1');
   });
 
   it('never hides a fractional value behind a whole number', () => {
@@ -50,13 +64,16 @@ describe('formatNumber', () => {
   });
 
   it('drops the minus sign from a value that displays as zero', () => {
-    expect(formatNumber(-0)).toBe('0.000');
-    expect(formatNumber(-0.0001)).toBe('0.000');
+    expect(formatNumber(-0)).toBe('0');
+    expect(formatNumber(-0.0001)).toBe('0');
+    expect(formatNumber(-0.04, 1)).toBe('0');
   });
 
-  it('honours an explicit precision', () => {
+  it('honours an explicit precision as an upper bound', () => {
     expect(formatNumber(1.25, 1)).toBe('1.3');
     expect(formatNumber(1.25, 0)).toBe('1');
+    expect(formatNumber(1.5, 2)).toBe('1.5');
+    expect(formatNumber(12, 2)).toBe('12');
   });
 
   it('shows a field of integral values without a decimal point at all', () => {