#A.19.SOURCE-SET-SPACE-SUBSTRATE:9 - Consequences

Preface node heading:a-19-source-set-space-substrate-9-consequences:24771

#What this page is

This is generated FPF reference text from the specification preface or supporting sections. It helps interpret FPF; it is not FPF Reference product documentation.

#Methodology

Use it to understand how the specification wants to be read, then return to a route, pattern, or work packet for active work. Cite generated IDs only when the wording changes the task decision.

#Content

Benefits

• Readers can see what the line is acting on, what spaces it distinguishes, what relation is declared between the two space refs, and what outcome load it claims.
• A.19, C.18, G.5, and G.10 stay coordinated without collapsing into one layer.
• Heavier qualifiers such as declared map refs, metrics, transitions, and bridge-loss notes remain usable without being forced into every first slice.

Trade-offs

• The line must expose one explicit relation and one explicit posture instead of hiding them in umbrella prose.
• Some cases that used to look "simple" will expose real uncertainty or loss that now needs to be declared.
• Neighboring interpretive-view or publication patterns may need to be read as companions rather than assumed from local shorthand.

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Last Updated: 2026-06-17 — upstream FPF commit 646b0b9b (github.com/ailev/FPF)