// Package assert provides compile-time-removable invariant checks.
//
// Use assert to document programmer contracts — preconditions, postconditions,
// and internal invariants that should be logically impossible to violate if the
// code is correct. A triggered assertion is always a bug, never a user error.
//
// Assertions are enabled by default (dev/debug builds). Disable them in
// production builds by passing -tags assert_disable to the Go toolchain:
//
//	go build -tags assert_disable ./...
//
// In a disabled build both [That] and [Thatf] are compiled out entirely — no
// condition is evaluated and no allocation occurs.
//
// Contrast with [gitea.djmil.dev/go/template/pkg/result], which handles runtime
// correctness (I/O, parsing, external inputs). Use result for things that can
// legitimately fail; use assert for things that must never fail.
package assert