Go's Multiple Return Values vs. Tuples: Historical Rationale from Developer Discussions and RFCs

Introduction Go's decision to favor multiple return values over a native tuple type is a cornerstone of its design philosophy, yet the historical rationale behind this choice remains underexplored. This article delves into the primary sources—early Go snapshots, developer communications, and RFCs—to uncover the mechanisms driving this decision. By examining the causal chain of design choices, we reveal how Go's focus on simplicity, explicitness, and error handling shaped its approach to returning multiple values. The Problem: Why Not Tuples? The absence of a native tuple type in Go is often contrasted with languages like Python or Rust, where tuples are a fundamental construct. However, Go's design philosophy prioritized clarity and explicitness, particularly in error handling. Early developer discussions, such as those found in Go mailing lists, highlight concerns that tuples could introduce implicit behavior, complicating error handling. For instance, a tuple might bundle an error wi