Add Go-style switch-case statement#478
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Implements switch/case/default/fallthrough/break with multi-value cases, tagless switch (acts as if/else chain), and optional init statement. - token: add Switch, Case, Default, Fallthrough keywords - parser: add SwitchStmt and CaseClause AST nodes, parseSwitchStmt/parseCaseClause - parser: fix expectSemi to accept case/default as implicit terminators - parser: add OpDup opcode (duplicates stack top for tag comparisons) - compiler: implement compileSwitchStmt with two-entry-point body pattern for correct stack discipline on fallthrough - compiler: update loop struct and branch handling so break/continue/fallthrough correctly target switch vs loop contexts - vm: add OpDup handler
freeze(x) recursively converts Arrays to ImmutableArrays and Maps to ImmutableMaps. Already-immutable values with no mutable children are returned as the same pointer (zero allocation). A memo table prevents infinite recursion on self-referential structures. Primitives, strings, bytes, functions and errors pass through unchanged. Closes the planned item from docs/freeze-builtin.md.
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Implements switch/case/default/fallthrough/break with multi-value cases, tagless switch (acts as if/else chain), and optional init statement. This solves #57 from way back in 2019.