try this this snipped. It works for positive numbers but not for negatives 
ones. 
Any ideas ?

<$edit-text  tiddler="weight" index="tmp" tag="input" type="number"/> 
<$button>
<$action-listops $tiddler="weight" $index="latest" $filter={{weight##tmp}}/>
<$action-listops $tiddler="weight" $index=<<now YYYY0MM0DD0hh0mm0ss>> 
$filter={{weight##tmp}}/>record
</$button>

weight -> {{weight}}
weight##latest -> {{weight##latest}}

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