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fields.Constant with required=True flag raised load_default warning

Status: Open.

#2900 In marshmallow-code/marshmallow;

· nosnickid opened on Feb 17, 2026

utils.get_value raise TypeError with out-of-range int index

Status: Open.

#2893 In marshmallow-code/marshmallow;

· thanhlecongg opened on Jan 10, 2026

Feature - allow inheriting load_default from nested schema populated with from_dict

Status: Open.

#2889 In marshmallow-code/marshmallow;

· nneul opened on Jan 6, 2026

3.x: Mypy Unreachable

Status: Open.

#2879 In marshmallow-code/marshmallow;

· deckar01 opened on Dec 22, 2025

Performance impact of Nested with many vs List of Nested.

Status: Open.

#2872 In marshmallow-code/marshmallow;

· mspiller opened on Dec 1, 2025

OneOf.options() emits extra pairs when labels outnumber choices

Status: Open.

#2869 In marshmallow-code/marshmallow;

· T90REAL opened on Nov 26, 2025

Infinite recursion in docs - Nesting a schema within itself

Status: Open.

#2851 In marshmallow-code/marshmallow;

· piyush-jaiswal opened on Sep 20, 2025

Consistency with allow_none with serialization and deserialization

Status: Open.

#2836 In marshmallow-code/marshmallow;

· matejsp opened on Jul 16, 2025

SchemaOpts misses partial

Status: Open.

#2834 In marshmallow-code/marshmallow;

· number492 opened on Jun 24, 2025

'NoneType' object is not subscriptable when serializing fields that do not belong to the database is None

question

Status: Open.

#2833 In marshmallow-code/marshmallow;

· dinghao-8 opened on Jun 20, 2025

Removing Schema context feels like a bad idea!

Status: Open.

#2832 In marshmallow-code/marshmallow;

· ThiefMaster opened on Jun 20, 2025

Is there a way to pre-define built-in validators that can be used multiple times?

question

Status: Open.

#2829 In marshmallow-code/marshmallow;

· herkalurk opened on Jun 3, 2025