An interactive concept flow for when a runtime compiles hot code, from its assumptions through the main operation and boundary checks.
trace / request.md
readyA just-in-time compiler translates code while a program runs. A runtime may begin by interpreting or compiling quickly, then use execution counters or profiling to identify frequently executed paths worth optimizing. The result can be specialized using assumptions about observed types and control flow.
Use the stages in order to explain when a runtime compiles hot code. Each stage makes one assumption visible: what the operation promises, what representation it uses, how state changes, which boundary can invalidate a shortcut, and what evidence confirms the result.
For a worked explanation, continue to the topic article and execution trace.
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