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Environment variable projection: Required absent variables are silently omitted · case 03

Required absent variables are silently omitted.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

For declared variable names return exact present environment value, otherwise explicit default including empty values. Required missing values report missing; optional missing values are omitted. Prefix is prepended before lookup.

Why this case matters

An offline model of environment variable projection, suitable for testing build and release tooling without external services.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
fixture 5	`{}`	`{"PORT": "missing"}`	Failed

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