Trying to add a mutable/immutable characteristics:

to remaind you:

Mutable are the Rebol values, that can be changed, that can change
state,... (more like a storage than like a value in a sense)

Immutable are the Rebol values that you cannot change (really
values in a sense)

> any-type ;undecidable
>     any-function ;undecidable
>         action ; immutable
>         function ; mutable
>         native ; immutable
>         op ; immutable
>     any-word ; mutable
>         get-word ; mutable
>         lit-word ; mutable
>         refinement ; mutable
>         set-word ; mutable
>         word ; mutable
>     bitset ; immutable
>     char ; immutable
>     date ; immutable
>     error ; mutable
>     logic ; immutable
>     money ; immutable
>     none ; immutable

>     number ; immutable
>         integer ; immutable
>         decimal ; immutable
>     object ; mutable
>     port ; mutable
>     series ; undecidable
>         any-block ; mutable
>             block ; mutable
>             list ; mutable
>             lit-path ; immutable
>             hash ; mutable
>             paren ; mutable
>             path ; immutable
>             set-path ; immutable
>         any-string ; mutable
>             binary ; mutable
>             email ; mutable
>             file ; mutable
>             issue ; mutable
>             string ; mutable
>             tag ; mutable
>             url ; mutable
>     symbol ; immutable
>     time ; immutable
>     tuple ; immutable
>     unset ; immutable

Any corrections?
    Ladislav

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