Tiddlywiki Custom Field Sort As Number

Question

I'm making a TiddlyWiki where some of the tiddlers contain the following fields: age year month date corresponding to the date of the tiddler in a fictional universe (hence I can't use the existing date fields, the calendar is different).

I have this code that creates a list and sorts tiddlers more or less correctly by age, year, month, date in that order:

<$list filter="[tag[history]] [tag[progress]] +[!sort[date]!sort[month]!sort[year]!sort[age]]">
<$link>{{!!title}}</$link> | <span style="font-weight: bold;">Age:</span> {{!!age}} <span style="font-weight: bold;">Year:</span> {{!!year}} <span style="font-weight: bold;">Month:</span> {{!!month}} <span style="font-weight: bold;">Date:</span> {{!!date}}<br>
</$list>

But when I have a field that is say month:11 it gets sorted after month:1 and before month:2 because it's being evaluated and sorted as text.

So my question comes down to how can I force sort[] to treat its parameter like an integer, or how can I tell TiddlyWiki what kind of data I'm storing in my custom fields?

Solution

Use nsort[] instead of sort[]