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Inline definitions in interfaces
================================
There are two use cases where definitions can be fully "exposed" in the
module interface:
1. Function bodies that are inlined
2. Constants
Both allow optimizations to be made. Exposed constants also allow the data
item to be used as a constant value (e.g. in array lengths).
(For constants, it could be emulated with enum constants.)
Problem:
- What should happen if the constant value or function body changes?
- Should changes be allowed at all?
Solutions
---------
Alt. 1: Simply forbid modification (without a version change)
- Least surprises
- Other languages already use lockfiles that lock the implementation
- Changes must be versioned.
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