I've been writing all my socket code (this is embedded so plain C) to be automatically compatible with either IPv4 or IPv6 for, what, ten years? I thought every

I've been writing all my socket code (this is embedded so plain C) to be automatically compatible with either IPv4 or IPv6 for, what, ten years? I thought everybody did that (it's best practice). Don't most higher level languages also just do this by default under the hood?