Template which rounds it's argument to an integer, rounding halves to the closest even integer.
No rounding:
{{RoundToEven|1}}: {{#vardefine:iseven|0
{{RoundToEven|2}}: {{#vardefine:iseven|0
{{RoundToEven|3}}: {{#vardefine:iseven|0
Normal rounding:
{{RoundToEven|0.4}}: {{#vardefine:iseven|1
{{RoundToEven|0.6}}: {{#vardefine:iseven|1
{{RoundToEven|1.5}}: {{#vardefine:iseven|0
{{RoundToEven|3.5}}: {{#vardefine:iseven|0
Rounding to even:
{{RoundToEven|0.5}}: {{#vardefine:iseven|0
{{RoundToEven|2.5}}: {{#vardefine:iseven|0
{{RoundToEven|4.5}}: {{#vardefine:iseven|0
{{RoundToEven|6.5}}: {{#vardefine:iseven|0