ruby-grape / grape / 23097820301 / 19

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master: 97%

Pull #2657

github

Instantiate validators at definition time

Validators are now instantiated once at route definition time rather
than per-request, eliminating repeated allocation overhead. Instances
are frozen to make them safe for sharing across requests.

Freezing strategy: inputs (attrs, options, opts) are frozen at the DSL
boundary before entering the validator, so subclass ivars derived from
them are frozen by construction. Base.new reduces to super.freeze.
Remove freeze_state! and ValidatorFactory.

ParamsScope: precompute full_path via build_full_path before
instance_eval so child scopes can read the parent path immediately.
Simplify meets_hash_dependency? with all? and dependency.first.

Validators::Base: add validation_error! helper to replace repeated
Grape::Exceptions::Validation.new calls across single-attr validators.

Fix DefaultValidator to always dup duplicable default values regardless
of frozen state, preserving per-request isolation.

Add DeepFreeze utility (freezes Hash/Array/String recursively, skips
Procs, coercers, and classes). Add specs for DeepFreeze,
SameAsValidator, and ExceptValuesValidator.

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