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From the CEL Github page:

> The required components of a system that supports CEL are:

> The textual representation of an expression as written by a developer. It is of similar syntax to expressions in C/C++/Java/JavaScript

Ok

> A binary representation of an expression. It is an abstract syntax tree (AST).

> A compiler library that converts the textual representation to the binary representation. This can be done ahead of time (in the control plane) or just before evaluation (in the data plane).

> A context containing one or more typed variables, often protobuf messages. Most use-cases will use attribute_context.proto

> An evaluator library that takes the binary format in the context and produces a result, usually a Boolean.

Why? All of these sound like implementation details to me, some of which I prefer not to have, such as the necessity for binary representation.



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