Compress RBS::Environment#inspect

[pocke]

This pull request introduces RBS::Environment#inspect method to make inspect's result shorter.

Problem

In most cases, RBS::Environment#inspect displays too many characters. #inspect should return a human-readable string, but it actually returns NOT human-readable string.
For example:

$ ruby -Ilib -rrbs -e 'p RBS::Environment.from_loader(RBS::EnvironmentLoader.new).resolve_type_names'
# => 🙈

I got the too long inspection from IRB, error message and so on.

Solution

Make the inspection shorter.
This pull request omits inspect for instance variables, displays only sizes instead.

For example:

$ ruby -Ilib -rrbs -e 'p RBS::Environment.from_loader(RBS::EnvironmentLoader.new).resolve_type_names'
#<RBS::Environment @buffers=(0 items) @declarations=(824 items) @class_decls=(266 items) @interface_decls=(14 items) @alias_decls=(6 items) @constant_decls=(538 items) @global_decls=(0 items)>

It has only a few pieces of information, but it is human-readable. I think readability is more important than omitted information.

[soutaro]

🤩 🗑️