Reads a selected value as a number.
Empty text is rejected rather than read as zero, so that a missing figure isn't passed downstream as a plausible one.
The Target to read, either a selected node or a computed value
The number written in the text of node
node
TypeError If the text of node is not a finite number
Reads a selected value as a number.
Empty text is rejected rather than read as zero, so that a missing figure isn't passed downstream as a plausible one.