Feature Proposal
The band around the line:

Feature Use Case
I'm visualizing ratings over time, these ratings are accompanied by an uncertainty at every point in time.
Possible Implementation
By adding 'up' and 'down' information to points in the datasets, the line charts could include confidence intervals around the lines {x:0, y:10, u:2, d:1}
Feature Proposal
The band around the line:

Feature Use Case
I'm visualizing ratings over time, these ratings are accompanied by an uncertainty at every point in time.
Possible Implementation
By adding 'up' and 'down' information to points in the datasets, the line charts could include confidence intervals around the lines
{x:0, y:10, u:2, d:1}