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test("numeric properties", () => {
const i32Max = 2 ** 31 - 1;
const u32Max = 2 ** 32 - 1;
const o = {
[-1]: "foo",
0: "foo",
1: "foo",
[i32Max - 1]: "foo",
[i32Max]: "foo",
[i32Max + 1]: "foo",
[u32Max - 1]: "foo",
[u32Max]: "foo",
[u32Max + 1]: "foo",
};
// Numeric properties come first in Object.getOwnPropertyNames()'s output,
// which means we can test what each is treated as internally.
expect(Object.getOwnPropertyNames(o)).toEqual([
// Numeric properties
"0",
"1",
"2147483646",
"2147483647",
"2147483648",
"4294967294",
// Non-numeric properties
"-1",
"4294967295", // >= 2^32 - 1
"4294967296", // >= 2^32 - 1
]);
});
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