round_significant
Round a number value to a number of significant digits. The significance defaults to two digits.
Example:
{{ 1256|round_significant }}
{{ 1256|round_significant:1 }}
{{ 1256|round_significant:3 }}
Results in:
1300
1000
1260
Floating point values are also rounded to a number of digits. For example
if n is set to 1256.78 then:
{{ n|round_significant }}
{{ n|round_significant:3 }}
{{ n|round_significant:5 }}
Results in:
1300.0
1260.0
1256.8
Input values that are not a number are converted to a floating point value. If the
conversion fails then undefined is returned.