It'd be nice to be consistent and symmetric with the use of the decimal point, i.e. one of:
 - `[-3.0, -1.0, -0.3, -0.1, 0.1, 0.3, 1.0, 3.0]`,
 - `[-3, -1, -0.3, -0.1, 0.1, 0.3, 1, 3]`,
 - or perhaps even `[-3, -1, -.3, -.1, .1, .3, 1, 3]`.