docs: add 2LTT notes on equality, staging, and coercions - #118
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Capture a design discussion covering definitional vs propositional equality, conversion vs staging (strictness), weak object equality and how it affects control over generated code, the no-intensional-analysis restriction, expressing propositions about behaviour rather than syntax, and the rules for adding implicit coercions in Splic (definitional-iso principle, one-way meta-erased canonicalizers, Embed as serialization, definability as a conservativity check). Linked from the bs index. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Capture a design discussion covering definitional vs propositional equality, conversion vs staging (strictness), weak object equality and how it affects control over generated code, the no-intensional-analysis restriction, expressing propositions about behaviour rather than syntax, and the rules for adding implicit coercions in Splic (definitional-iso principle, one-way meta-erased canonicalizers, Embed as serialization, definability as a conservativity check). Linked from the bs index.