Parse XML attribute hashes without the removed deserializer

[OskarEichler]

Summary

AttributeHash inherits element lookup despite writing parent attributes. Read attribute nodes and replace the stale reference to nonexistent HashDeserializer.

Reproduction

require 'representable/xml'
require 'representable/xml/binding'
mod=Module.new { include Representable::XML; hash :values, use_attributes: true }
p Struct.new(:values).new.extend(mod).from_xml(%q{<item first='one'/>}).values
# nil before; {'first'=>'one'} after

Verification

• Existing master suite on this isolated branch: 545 tests / 701 assertions, zero failures/errors, three existing skips on Ruby 3.2.11. Ruby 4.0.6 retains the same eight legacy inspection-format failures, zero errors and three skips. Existing tests/expectations are unchanged.
• 50 focused checks on Ruby 3.2.11/4.0.6 for this change. XML first-render uses a separate fresh-process check.
• Combined release-based verification with other focused fixes and attributed Use Setter in OverwriteOnNil if a :setter is defined #177/Hash value of null breaks parsing #264/Update MultiJSON usage to address deprecations #273 source backports: 544 tests / 700 assertions pass on Ruby 3.2.11, plus 4,410 focused checks and 36 boundary checks. Package retains 104 paths and unchanged compared metadata. All 36 runtime files compile on both Rubies; no newly introduced default Lint offenses.

Breaking changes / limitations

Attribute-hash properties now read their emitted data; no parent attributes yields an empty hash. Namespace-qualified attribute semantics are not expanded.

No new/modified checked-in tests. Ruby 2.4–3.1, JRuby, Windows and Linux were not executed locally. Ruby >=2.4 and runtime dependency ranges remain unchanged. External test tooling supplies a legacy MiniTest alias and ruby-prof 1.7.x; no assertions were changed. No production verification is claimed.

[seuros]

why was HashDeserializer removed ?

Also a fix will need to have regression test attached.

Thanks for addressing this bug btw.

PS: i rebased this branch.

[OskarEichler]

HashDeserializer no longer exists anywhere in the current XML implementation, so the remaining call could not succeed. The branch now reads the node attributes directly and includes a focused regression test for AttributeHash#read. The full xml_bindings_test.rb file passes: 5 tests, 5 assertions.