fix maybeSingle w/ throwOnError w/ n > 1 results

[maxkostow]

What kind of change does this PR introduce?

Bug fix

What is the current behavior?

.maybeSingle()
.throwOnError()

Does not throw when results.length > 1

What is the new behavior?

Throws the error when results.length > 1

Additional context

Related to #424

[mandarini]

Hi @maxkostow ! Thanks for the contribution and your patience.

This repository is deprecated and has moved to the new Supabase JS monorepo. Since this PR has been inactive for over a year, I’m going to close it to keep the old repo tidy, before archiving.

If you believe this change is still needed, please open a new PR in the monorepo and include a link back to this thread for context:

• Monorepo: https://github.com/supabase/supabase-js
• Package location: packages/core//
• Migration guide: https://github.com/supabase/supabase-js/blob/master/docs/MIGRATION.md
• Contributing guide: https://github.com/supabase/supabase-js/blob/master/CONTRIBUTING.md

Note: This old repository will be archived on October 10, 2025. Thank you again for your effort and understanding!