JsonElement / JsonProperty - get utf-8 property name without allocations

[exyi]

Hello, I'm looking for a way to enumerate a JsonElement object properties, ideally free of heap allocations. Currently, I see two options for accessing the property name - JsonProperty.Name and JsonProperty.NameEquals (if I know the possible names). The Name property however allocates a new string every time, and it doesn't seem to do any interning.

foreach (var p in obj.EnumerateObject())
{
    p.Name // returns newly allocated string
    p.NameEquals("abc"u8) // I don't know all possible names
}

Is there any other way? I'm looking for something like Utf8JsonReader.CopyString(Span<byte> utf8Destination). I actually want the name in utf-8, so decoding it using the Name property just to encode it back feels quite dumb :]

[huoyaoyuan]

There's a similar discussion for Value in #77666. Escaping may make things complex.

[exyi]

Thanks, I didn't notice this one. I suppose the potential CopyString(Span<byte>) should also be added to JsonProperty to allow allocation free reading of properties. The Utf8JsonReader.CopyString unescapes the string, so I suppose escaping should not be issue here. The #30207 issue is actually closer to what I need, but is unfortunately closed as "won't do" :/