relnotes/v0.37.0.md
### New features
* [#2620](https://github.com/rubocop/rubocop/pull/2620): New cop `Style/ZeroLengthPredicate` checks for `object.size == 0` and variants, and suggests replacing them with an appropriate `empty?` predicate. ([@drenmi][])
* [#2657](https://github.com/rubocop/rubocop/pull/2657): Floating headers in HTML output. ([@mattparlane][])
* Add new `Style/SpaceAroundKeyword` cop. ([@lumeet][])
* [#2745](https://github.com/rubocop/rubocop/pull/2745): New cop `Style/MultilineHashBraceLayout` checks that the closing brace in a hash literal is symmetrical with respect to the opening brace and the hash elements. ([@panthomakos][])
* [#2761](https://github.com/rubocop/rubocop/pull/2761): New cop `Style/MultilineMethodDefinitionBraceLayout` checks that the closing brace in a method definition is symmetrical with respect to the opening brace and the method parameters. ([@panthomakos][])
* [#2699](https://github.com/rubocop/rubocop/pull/2699): `Performance/Casecmp` can register offenses when `str.downcase` or `str.upcase` are passed to an equality method. ([@rrosenblum][])
* [#2766](https://github.com/rubocop/rubocop/pull/2766): New cop `Style/MultilineMethodCallBraceLayout` checks that the closing brace in a method call is symmetrical with respect to the opening brace and the method arguments. ([@panthomakos][])
### Bug fixes
* [#2723](https://github.com/rubocop/rubocop/issues/2723): Fix NoMethodError in Style/GuardClause. ([@drenmi][])
* [#2674](https://github.com/rubocop/rubocop/issues/2674): Also check for Hash#update alias in `Performance/RedundantMerge`. ([@drenmi][])
* [#2630](https://github.com/rubocop/rubocop/issues/2630): Take frozen string literals into account in `Style/MutableConstant`. ([@segiddins][])
* [#2642](https://github.com/rubocop/rubocop/issues/2642): Support assignment via `||=` in `Style/MutableConstant`. ([@segiddins][])
* [#2646](https://github.com/rubocop/rubocop/issues/2646): Fix auto-correcting assignment to a constant in `Style/ConditionalAssignment`. ([@segiddins][])
* [#2614](https://github.com/rubocop/rubocop/issues/2614): Check for zero return value from `casecmp` in `Performance/casecmp`. ([@segiddins][])
* [#2647](https://github.com/rubocop/rubocop/issues/2647): Allow `xstr` interpolations in `Lint/LiteralInInterpolation`. ([@segiddins][])
* Report a violation when `freeze` is called on a frozen string literal in `Style/RedundantFreeze`. ([@segiddins][])
* [#2641](https://github.com/rubocop/rubocop/issues/2641): Fix crashing on empty methods with block args in `Performance/RedundantBlockCall`. ([@segiddins][])
* `Lint/DuplicateMethods` doesn't crash when `class_eval` is used with an implicit receiver. ([@lumeet][])
* [#2654](https://github.com/rubocop/rubocop/issues/2654): Fix handling of unary operations in `Style/RedundantParentheses`. ([@lumeet][])
* [#2661](https://github.com/rubocop/rubocop/issues/2661): `Style/Next` doesn't crash when auto-correcting modifier `if/unless`. ([@lumeet][])
* [#2665](https://github.com/rubocop/rubocop/pull/2665): Make specs pass when running on Windows. ([@jonas054][])
* [#2691](https://github.com/rubocop/rubocop/pull/2691): Do not register an offense in `Performance/TimesMap` for calling `map` or `collect` on a variable named `times`. ([@rrosenblum][])
* [#2689](https://github.com/rubocop/rubocop/pull/2689): Change `Performance/RedundantBlockCall` to respect parentheses usage. ([@rrosenblum][])
* [#2694](https://github.com/rubocop/rubocop/issues/2694): Fix caching when using a different JSON gem such as Oj. ([@stormbreakerbg][])
* [#2707](https://github.com/rubocop/rubocop/pull/2707): Change `Lint/NestedMethodDefinition` to respect `Class.new` and `Module.new`. ([@owst][])
* [#2701](https://github.com/rubocop/rubocop/pull/2701): Do not consider assignments to the same variable as useless if later assignments are within a loop. ([@owst][])
* [#2696](https://github.com/rubocop/rubocop/issues/2696): `Style/NestedModifier` adds parentheses around a condition when needed. ([@lumeet][])
* [#2666](https://github.com/rubocop/rubocop/issues/2666): Fix bug when auto-correcting symbol literals in `Lint/LiteralInInterpolation`. ([@lumeet][])
* [#2664](https://github.com/rubocop/rubocop/issues/2664): `Performance/Casecmp` can auto-correct case comparison to variables and method calls without error. ([@rrosenblum][])
* [#2729](https://github.com/rubocop/rubocop/issues/2729): Fix handling of hash literal as the first argument in `Style/RedundantParentheses`. ([@lumeet][])
* [#2703](https://github.com/rubocop/rubocop/issues/2703): Handle byte order mark in `Style/IndentationWidth`, `Style/ElseAlignment`, `Lint/EndAlignment`, and `Lint/DefEndAlignment`. ([@jonas054][])
* [#2710](https://github.com/rubocop/rubocop/pull/2710): Fix handling of fullwidth characters in some cops. ([@seikichi][])
* [#2690](https://github.com/rubocop/rubocop/issues/2690): Fix alignment of operands that are part of an assignment in `Style/MultilineOperationIndentation`. ([@jonas054][])
* [#2228](https://github.com/rubocop/rubocop/issues/2228): Use the config of a related cop whether it's enabled or not. ([@madwort][])
* [#2721](https://github.com/rubocop/rubocop/issues/2721): Do not register an offense for constants wrapped in parentheses passed to `rescue` in `Style/RedundantParentheses`. ([@rrosenblum][])
* [#2742](https://github.com/rubocop/rubocop/issues/2742): Fix `Style/TrailingCommaInArguments` & `Style/TrailingCommaInLiteral` for inline single element arrays. ([@annih][])
* [#2768](https://github.com/rubocop/rubocop/issues/2768): Allow parentheses after keyword `not` in `Style/MethodCallParentheses`. ([@lumeet][])
* [#2758](https://github.com/rubocop/rubocop/issues/2758): Allow leading underscores in camel case variable names. ([@mmcguinn][])
### Changes
* Remove `Style/SpaceAfterControlKeyword` and `Style/SpaceBeforeModifierKeyword` as the more generic `Style/SpaceAroundKeyword` handles the same cases. ([@lumeet][])
* Handle comparisons with `!=` in `Performance/casecmp`. ([@segiddins][])
* [#2684](https://github.com/rubocop/rubocop/pull/2684): Do not base `Style/FrozenStringLiteralComment` on the version of Ruby that is running. ([@rrosenblum][])
* [#2732](https://github.com/rubocop/rubocop/issues/2732): Change the default style of `Style/SignalException` to `only_raise`. ([@bbatsov][])
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