Duktape 2.4.0 - Githubissues

Update Duktape version to 2.4.0.
See the release notes for more info.
Add bindings for to_stacktrace, safe_to_stacktrace, push_bare_array, require_constructable, and require_constructor_call.
Allow C compiler flag overrides when compiling Duktape. Define the CFLAGS variable during shards install (i.e. CFLAGS=-O1 shards install).
No longer explicitly enable Duktape's Symbol builtin as it is now enabled by default.

jessedoyle / duktape.cr