WASM Client no way to get Body from stream.

[AlexanderSchuetz97]

Hello, I am not sure if this is intentional due to the limitations of the underlying fetch api but there seems to be no way to
get a reqwest::Body in wasm from anything Streamable for example (dyn io::Read+Send impl or dyn AsyncRead+Send impl)
The only constructors I have found are for String/Vec u8/slice u8.
This kinda requires getting the entire stream of data into a single chunk of memory.
Given the current limitation of wasm's 32 bit address space this limits the maximum body size of a post to < 4GB. (realistically much less given that my rust wasm program itself probably also needs some space...)

Is this a browser limitation or Is this me not seeing something obvieus?