[yousefissa]

Summary

Closes #185.

Indexed Set on typed slices writes into a temporary []any, losing the update. Assign through the original slice storage instead, including nested and named slices, without copying the final slice.

Preserve []any in-place mutation and use the same behavior for typed slices. Ignore incompatible values without conversion or panic; accept nil only for element types that can hold nil. Update the Set documentation and add regressions for aliasing, assignability, nil values (including typed nil in interfaces), and unsupported paths.

Validation

• go test -race -count=1 ./... passes on Go 1.25.0 and 1.26.8.
• golangci-lint v2.14.0 reports zero issues; formatting checks pass.
• go generate ./... leaves generated files unchanged.

Prepared with OpenAI Codex.

[hanzei]

LGTM