> But I'd like to count the length of a field, something like
> "tiddler.myfield.length"... Is it possible?

As you noted in your message, standard core-defined tiddler fields
(e.g., title, text, tags, modifier, modified, created) can be
referenced directly from the tiddler object (e.g, tiddler.text,
tidder.tags, tiddler.modifier, etc.).

However, *custom* tiddler fields are stored in a separate associative
array within the tiddler, called 'fields[...]'.

Thus, to reference a custom field, use:
   tiddler.fields.fieldname
and to get the length of the field:
   tiddler.fields.fieldname.length

enjoy,
-e

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