`Url.modifyUrlParams` doesn't preserve percent encoding of spaces

[astlouisf]

What version of Effect is running?

@effect/platform@0.96.0

What steps can reproduce the bug?

The issue is that Url.modifyUrlParams automatically changes %20 to + in query parameters, often time affecting parameters that are not the target of any modification.

in Node

const {Url} = await import("@effect/platform");
const identity = x => x;
const url = new URL("https://example.com?foo=bar%20baz");
const url2 = Url.modifyUrlParams(url, identity);
url.href === url2.href // false, but feels like it should be true

What is the expected behavior?

url2.href should preserve the percent encoding.

What do you see instead?

url2.href contain + rather than percent encoded spaces.

Additional information

No response