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Variable substitution fails unexpectedly with overloaded values using resolveWith()

Status: Open.

#855 In lightbend/config;

· achohbee opened on Jun 18, 2026

Proposal: Support inline fallback syntax for substitutions (e.g. ${VAR:default})

Status: Open.

#827 In lightbend/config;

· Frotas opened on Oct 3, 2025

ConfigObject is not immutable - can mutate through keySet()

Status: Open.

#819 In lightbend/config;

· A248 opened on Jun 9, 2025

Missing separator between list elements leads to unintended merge

Status: Open.

#814 In lightbend/config;

· andymalakov opened on Apr 15, 2025

Large number of appends for a single key is very slow to resolve

Status: Open.

#813 In lightbend/config;

· karlwalsh opened on Jan 23, 2025

Inheritance breaks configuration file overlays

Status: Open.

#812 In lightbend/config;

· danielyli opened on Dec 10, 2024

When rendering unresolved ConfigConcatenation, whitespaces are erroneously included

Status: Open.

#806 In lightbend/config;

· guerrillalg opened on Jun 26, 2024

Add a module info

Status: Open.

#803 In lightbend/config;

· bowbahdoe opened on Feb 25, 2024

Regression in environment variable reading behavior

Status: Open.

#802 In lightbend/config;

· ilinandrii opened on Jan 16, 2024

Inconsistent behavior with Overflow/Underflow and Exceptions

Status: Open.

#801 In lightbend/config;

· zleonov opened on Nov 30, 2023

Rendering partially resolved appended array results in invalid configuration

Status: Open.

#800 In lightbend/config;

· tmccombs opened on Nov 28, 2023

Cannot provide environment variables programmatically

Status: Open.

#796 In lightbend/config;

· przemek-pokrywka opened on Aug 9, 2023