5.3.3
  No changes
5.3.2
- Added types for control operators
- Added `typed/untyped-utils`
5.3.1
- Revised handling of `Any` exported to untyped code
- Added `cast`
- Correctly compute variance of polymorphic type application
5.3
- Keyword and optional arguments
- Faster startup
- Random testing of the numeric tower
5.2.1
- Inference of functions with keyword arguments
- `typecheck-fail' for explicit creation of type errors
- Extensive documentation of typed numeric tower
5.2
- Performance work: delayed environment evaluation
- Support `racket'-style optional arguments
- Changes to support new-style keyword argument expansion

5.3.4
- Moved Optimization Coach to the package system
- Multiple fixes to polydots
5.3.3
  No changes
5.3.2
- Added types for control operators
- Added `typed/untyped-utils`
5.3.1
- Revised handling of `Any` exported to untyped code
- Added `cast`
- Correctly compute variance of polymorphic type application
5.3
- Keyword and optional arguments
- Faster startup
- Random testing of the numeric tower
5.2.1
- Inference of functions with keyword arguments
- `typecheck-fail' for explicit creation of type errors
- Extensive documentation of typed numeric tower
5.2
- Performance work: delayed environment evaluation
- Support `racket'-style optional arguments
- Changes to support new-style keyword argument expansion

Update TR history for 5.3.4.
Update TR history for 5.3.4.
