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The results vary depending on the position of the “optional” in the schema with preprocess since v4.4.0

bug

Status: Open.

#5917 In colinhacks/zod;

· mdoi2 opened on May 1, 2026

Wrong code example for codec inversion in the 4.4.0 release notes

Status: Open.

#5911 In colinhacks/zod;

· Nicolapps opened on Apr 30, 2026

Pass arguments from .apply to schema mapper

Status: Open.

#5909 In colinhacks/zod;

· DesselBane opened on Apr 30, 2026

v4: toJSONSchema anyOf incompatibility with Gemini API Function Calling

Status: Open.

#5807 In colinhacks/zod;

· Rintarooo opened on Mar 26, 2026

preprocess doesn't constrain return type of fn to the type of the output schema

Status: Open.

#5733 In colinhacks/zod;

· ericnorris opened on Feb 26, 2026

Weird error message after update | 4.3.6

Status: Open.

#5697 In colinhacks/zod;

· alpeer opened on Feb 8, 2026

[V4]: Cannot pipe to less restrictive schema

Status: Open.

#5694 In colinhacks/zod;

· sybereal opened on Feb 6, 2026

Zod incorrectly points to CommonJS declaration when used with ESM

Status: Open.

#5686 In colinhacks/zod;

· patrickshipe opened on Feb 4, 2026

Stripping Unrecognised keys from enum record.

Status: Open.

#5666 In colinhacks/zod;

· CodingGreen opened on Jan 27, 2026

intersection (.and(...)) does not run check, superRefine or transform functions (and probably others)

Status: Open.

#5663 In colinhacks/zod;

· mrft opened on Jan 26, 2026

Inferred typescript types of schema union combined with intersection do not match validation rules

Status: Open.

#5662 In colinhacks/zod;

· mrft opened on Jan 24, 2026

Branding gets dropped in zod v4 from transforms and pipes

Status: Open.

#5648 In colinhacks/zod;

· alexhladun-orennia opened on Jan 20, 2026