fix stringify not picking up negative zero if a normal zero has appeared before it (#87)

* fix stringify not picking up negative zero if a normal zero has appeared before it

* changeset

---------

Co-authored-by: Rich Harris <[email protected]>

Author: omkelderman

.changeset/shaggy-bars-hear.md

@@ -0,0 +1,5 @@
+---
+'devalue': patch
+---
+
+fix: correctly differentiate between +0 and -0

src/stringify.js

@@ -48,14 +48,14 @@ export function stringify(value, reducers) {
 			throw new DevalueError(`Cannot stringify a function`, keys);
 		}
 
-		if (indexes.has(thing)) return indexes.get(thing);
-
 		if (thing === undefined) return UNDEFINED;
 		if (Number.isNaN(thing)) return NAN;
 		if (thing === Infinity) return POSITIVE_INFINITY;
 		if (thing === -Infinity) return NEGATIVE_INFINITY;
 		if (thing === 0 && 1 / thing < 0) return NEGATIVE_ZERO;
 
+		if (indexes.has(thing)) return indexes.get(thing);
+
 		const index = p++;
 		indexes.set(thing, index);
 

test/test.js

@@ -132,6 +132,12 @@ const fixtures = {
 			js: '["a","b","c"]',
 			json: '[[1,2,3],"a","b","c"]'
 		},
+		{
+			name: 'Array where negative zero appears after normal zero',
+			value: [0, -0],
+			js: '[0,-0]',
+			json: '[[1,-6],0]'
+		},
 		{
 			name: 'Array (empty)',
 			value: [],