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use B ();
use POSIX ();
use JSON::PP ();
use Scalar::Util qw(looks_like_number);

# Lightweight evaluator for the pure `ParsedExpr` subset, scoped to
# higher-order callback bodies (reduce / sort / map / filter / find
# `(…) => expr`) — issue #2018. Templates cannot carry a lambda in
# expression position, which is why the adapters historically special-cased
# these callbacks into fixed shapes (bf_sort's comparator catalogue,
# bf_reduce's +/* fold). Instead, the callback BODY rides as a pure
# `ParsedExpr` subtree (the structured IR the compiler already produces) and
# is evaluated here against an environment (`{acc, item, …captured free
# vars}`).
#
# ONE shared implementation for both Perl backends (Mojo + Xslate), living
# alongside SearchParams.pm in the engine-agnostic core (no CPAN deps beyond
# core B / POSIX / Scalar::Util). The accepted subset and its semantics are
# documented in spec/compiler.md ("ParsedExpr Evaluator Semantics") and pinned
# isomorphically by the cross-language golden vectors