respond() uses MISSING for embeds but send() is using None

[Snawe]

Summary

The new interaction resond() is using utils.MISSING for messages without embeds

What is the feature request for?

The core library

The Problem

respond() and send() are behaving differently in that way.

Example:
I am using a wrapper function like:

    async def channel_send(self, ctx, embed = None, text = None, view = None):
            if isinstance(ctx, discord.ext.commands.context.Context):
                message = await ctx.channel.send(content=text, embed=embed, view=view)
            elif isinstance(ctx, discord.commands.ApplicationContext):
                await ctx.respond(content=text, embed=embed, view=view)
                message = await ctx.interaction.original_message()

to support both slash commands and current prefix commands. But with the current behavior, embed=None would not work

The Ideal Solution

Also use None als default value for respond()

The Current Solution

Currently I am using it like this:

    async def channel_send(self, ctx, embed = None, text = None, view = None):
            if isinstance(ctx, discord.ext.commands.context.Context):
                message = await ctx.channel.send(content=text, embed=embed, view=view)
            elif isinstance(ctx, discord.commands.ApplicationContext):
                await ctx.respond(content=text, embed=embed if embed else discord.utils.MISSING, view=view)
                message = await ctx.interaction.original_message()

[Snawe]

BTW: I just saw that view also needs MISSING and its not just a respond() related "issue", it affects all interactions.