Numbers expressed in scientific notation are not highlighted properly 

For example, see this screenshot:

![Screenshot of PureScript code that uses scientific notation](https://user-images.githubusercontent.com/32234660/181577981-814b668d-c338-4a2d-bb9e-be27ddfffccb.png)

Contrast with e.g. Dart:

![Screenshot of Dart code that uses scientific notation](https://user-images.githubusercontent.com/32234660/181577925-065fd97e-8882-4b9e-9016-d556cdcc2e67.png)