Percent encoding of query string parameters

[avanigupta]

My service uses the following APIs to add URL query strings:
QueryHelpers.AddQueryString and QueryBuilder.Add

According to RFC 3986, I'm expecting all the reserved characters to be percent-encoded. But I notice that the following characters are not encoded:

@!$()*,;

In comparison, all reserved characters are being encoded by .NET Core Uri.EscapeDataString API. Why is the behavior different in aspnetcore?

QueryBuilder.Add

QueryHelpers.AddQueryString

Uri.EscapeDataString

[BrennanConroy]

https://source.dot.net/#System.Text.Encodings.Web/System/Text/Encodings/Web/DefaultUrlEncoder.cs,22 contains an explanation.

These are following RFC3987

[drago-draganov]

RFC3987 defines IRI, not URI.
According to section 3.1 Mapping of IRIs to URIs

mapping from IRIs to URIs produces URIs fully conforming to [RFC3986].

This doesn't seem to be the case for QueryBuilder if it follows RFC3987.