Should we support duplicated keys in an index?

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Description

Daru::Vector.new([1,2,3], index: [1,1,1])
=> IndexError: Expected index size >= vector size. Index size : 1, vector size : 3

Daru::Index.new([1,1,1])
=> #<Daru::Index(1): {1}>

[1,2,1].each_with_index.to_h
=> {1=>2, 2=>1}

Contributor guide

Research direction

Investigate how Index#initialize creates @relation hash and modify to handle duplicate keys appropriately, possibly by allowing duplicates or raising a clearer error.

Tech stack

ruby

Domain

data

Issue type

Bug

DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.

2

Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.

1-3 hours

Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.

Active

ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.

Clear

Prerequisites

Ruby

Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.

70