Jadpo is experimental and not ready for production. These docs follow the compiler's main branch as of 30 Oct 2026. What's built · Install 0.1.0
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Reference: Values and types

Values and types · rule

type.redundant_nullability

Type is already nullable.

Area 2, Values and types; not declinable; the next step is usually the agent's.

example
type ProductName = Text {    max_length: 120}type Listing = Object {    subtitle: ProductName?}type ListingPreview = Object {    subtitle: Listing.subtitle?}
text
error: `Listing.subtitle` already permits `none` --> main.jadpo:10:15   |10 |     subtitle: Listing.subtitle?   |               ^^^^^^^^^^^^^^^^^ nullable twice  reason: `Listing.subtitle` takes `none` from its declared type; a second `?` adds nothing.  next: Remove the extra `?` (agent)  rule: type.redundant_nullability  help: https://jadpo.dev/docs/errors/type.redundant_nullabilitycheck failed: 1 error, 1 file

Markdown for agents: /docs/errors/type.redundant_nullability.md.Built from Jadpo main at a707efb.