[nz]

Errgonomic 0.10.0 closes the four container-level issues the Sprout mass conversion filed against 0.9.0. They are a bare operand escaping Option#and, a public value slot on Some, Ok and Err, a deconstruct shape that missed in Some(v), and a cross-type == that answered false behind an opt-in flag. It stacks on the 0.9.1 branch, so this pull request is opened against 2026-09-10-errgonomic-0.9.x-triage/to-s-raise and merges after it. One choice below is the reviewer's to confirm: the top-level constants Some, None, Ok and Err, which the decision note marked as strikeable.

Closes #76, #77, #78, #79.

What changes

• Option#and, #xor, #zip and #zip_with raise Errgonomic::ArgumentError on a bare operand, on a None receiver as well as a Some, with the message or already gave. 0.9.x let Some(2).and(3) return 3, let a None receiver accept anything, and let zip and xor fall into a bare NoMethodError.
• Some, Ok and Err no longer expose value or value=, and every Option and Result is frozen on construction. A call from outside reaches method_missing and gets the combinator teaching as Errgonomic::UnwrappedAccessError.
• deconstruct answers [value] for Some, Ok and Err and [] for None, so in Some(v), in None, in Ok(Some(v)) and in Some({ id: }) all match, and a two-branch case/in with no else raises NoMatchingPatternError on a wrong type. A value-less Err() deconstructs to [], so in Err and in Err() match it and in Err(e) matches only an Err that carries a value. There is no deconstruct_keys. Some, None, Ok and Err are also top-level constants for the four classes.
• ==, !=, eql? and === between a wrapper and anything that is not one always raise Errgonomic::TypeMismatchError with the 0.9.0 message. Errgonomic.strict_equality=, strict_equality?, with_strict_equality and rake test:strict are removed.
• Version 0.10.0, with a changelog section whose upgrading note names each removed method and its replacement spelling.

How it works

• lib/errgonomic/option.rb: option_operand! runs before the discriminant in the five binary combinators; value is a protected reader on Some and the constructor freezes; deconstruct is to_a; strict_equality! no longer consults a flag, and === is defined so the message names the operator written. The doctests on == state the raise surface: which collection operations compare pairwise and raise, which go through a hash and stay quiet, and that nil == Some(1) is answered by NilClass.
• lib/errgonomic/result.rb: the same shape for Ok and Err, with the protected reader on Result::Any.
• lib/errgonomic.rb: the strict-equality flag and its block form are gone, and so is the unread lenient_inner_value_comparison? switch.
• lib/errgonomic/core_ext/enumerable.rb: sequence_options and sequence_results were the only readers of value outside the classes; they collect through tap_some and tap_ok.
• README.md: the pattern-matching examples take the Rust shape, the value-not-a-slot paragraph says why value is absent, and a Strict equality section states the raise surface.
• CHANGELOG.md: the 0.10.0 section and its upgrading note.

Every reproduction line in the four issues is a doctest on the method it exercises.

Evidence

Run locally on 2026-09-10, on aarch64-darwin inside the flake devshell:

• bundle exec rubocop: 23 files inspected, 6 offenses, all six pre-existing on main (Metrics on method_missing in option.rb and result.rb, Metrics on optional_dig, Style/Documentation on Errgonomic::Rails in active_record_optional.rb). None is in code this branch touches.
• bundle exec yard doctest: 187 runs, 486 assertions, 0 failures, 0 errors.
• bundle exec rake test: 132 runs, 464 assertions, 0 failures, 0 errors. This is the Rails integration suite, now under strict equality unconditionally.
• bundle exec rake: both of the above, same counts.
• nix build .#errgonomic: built errgonomic-0.10.0, with rake in its check phase.
• nix flake check --all-systems: all checks passed.
• A probe script loaded active_record, action_view, active_storage, action_text and rails and found Some, None, Ok and Err undefined at top level, so the constants collide with nothing Rails defines.

CI runs yard doctest and rake test on Ruby 3.4 on ubuntu-latest, the coverage this machine cannot give.

What is left open

• The Rails integration reached for .value nowhere, and the Rails suite and the Rails doctests passed under strict equality with no seam changed, so the two lists the charter asked for are empty. That is evidence from this gem's own suite only; the sprout-validation run against luis/prod-1613-mass-conversion-probe is where the application-side blast radius is measured. Recommendation: accept, and read the Sprout count before the release is cut.
• The top-level constants are the line the decision note said the driver may strike. Striking them is one deletion in each of option.rb and result.rb plus the README examples reverting to the long class names; the deconstruct shape does not depend on them. Recommendation: keep them, since in Some(v) is the whole point of the shape.

Background

Project charter: cowork/projects/2026-09-10-errgonomic-0.9.x-triage/README.md, with the three decisions under decisions/ dated 2026-09-10.

[nz]

Superseded by four stacked releases, one per issue, each with its own release commit:

1. Check the operand of and, xor, zip and zip_with, and release 0.9.2 #83 and-xor-zip -> 0.9.2 (and/xor/zip/zip_with skip the pedantic operand check; Some(x).and(y) returns the bare operand #78), base to-s-raise
2. Remove the value slot from Some, Ok and Err, freeze instances, and release 0.9.3 #84 value-is-not-a-slot -> 0.9.3 (Some#value= is a public mutable slot and #value an unguarded unwrap — contradicts the value-not-slot design #76), base and-xor-zip
3. Deconstruct in the Rust shape, name the variants at top level, and release 0.10.0 #85 deconstruct -> 0.10.0 (deconstruct returns [self, value] so Rust-shaped Some(v) patterns silently miss; no deconstruct_keys #77), base value-is-not-a-slot
4. Always raise on cross-type equality, drop the strict flag, and release 0.10.1 #86 strict-equality -> 0.10.1 (strict_equality is process-global (thread-unsafe) and raises from inside Hash/Array internals #79), base deconstruct

This branch stays in place for the Sprout validation run pinned to it.