`HTTP.sniff` for strings which starts a number.

[AtsushiSakai]

In this example:

In [5]: HTTP.sniff("A2")
"text/plain; charset=utf-8"

In [6]: HTTP.sniff("2A")
"application/json; charset=utf-8"

The first example makes sense, but I think the second one should not be categorized as JSON.

Is it expected?

• Julia 1.9.2
• HTTP.jl 1.9.14