Does not render multiple static styles for a single selector

[robinweser]

Version: 1.0.1
Environment: Both
Type: Bug

---

Description

Please try to add as much detail as possible.

Steps to reproduce

const renderer = createRenderer()

renderer.renderStatic({ color: 'red' }, 'div')
renderer.renderStatic({ fontSize: '12px' }, 'div')

Expected Behavior

Expected CSS output:

div {
  color: red
}

div {
  font-size: 12px
}

Actual Behavior

Actual CSS output:

div {
  color: red
}

Proposal

Not only use the selector as a cache reference, but the whole stringified style.