* Add sets.is_set() to test whether an arbitrary object is a set.
Since using sets requires special API, it can be useful to determine
whether an object is a set so special handling can be used.
For example, if a method wants to be able to take a list or a set.
* add empty CHANGELOG.md to try to reuse bazel release.sh
* checkpoint a new distribution method
* Update CHANGELOG.
* checkpoint relnew
* get the tarball working
* fix visibilyt
* whitespace
* punctuation typos
* buildify
* linty fresh
Most notably, this renames/moves a few important identifiers:
//:skylark_library.bzl -> //:bzl_library.bzl
skylark_library -> bzl_library
SkylarkLibraryInfo -> StarlarkLibraryInfo
When creating a skylark_library A anywhere downstream, if a bzl file in A loads() any of the bzl libraries in this package, then the bzl files in this package will have to be in deps as a skylark_library. The current public filegroup cannot be used as a dependency of skylark_libraries.
Even though it's not great to use type checks, they are frequently useful for
checking input types of macros.
Because there is no standard way of checking types, at least 2 types of checks
are used:
- `type(foo) == type([])`
- `type(foo) == "list"`
The first option is not very readable and the second option seem to be relying
on an Bazel implementation detail. Encapsulating type checks into this library
enables consistent and easy to understand type checking without explicitly
relying on implementation details.
This version is hash-based (implemented on top of a dictionary) and doesn't suffer the performance problems of the current version. It will eventually replace the old one after a deprecation period.
