Replacing a TokenizedString

[markfinal]

If you do the naive thing of

this.Macros["SomeMacro"] = this.CreateTokenizedString(...)

then the behaviour is not what you expect.
I believe this is because the original Macro TokenizedString is in the cache, and other TS's might be referencing it still, keeping it alive.

You can get the desired behaviour with

this.Macros["SomeMacro"].Set(...)

but you have to remember to do that.

There needs to be an improved mechanism for being able to replace an existing TS.

[markfinal]

For macros, I think the solution is to eliminate the indexer setter.
So you can only ever add a macro through a function, e.g. this.AddMacro(key,value).
But you can get it through the indexer.