maven-resolver-api/src/main/java/org/eclipse/aether/DefaultRepositorySystemSession.java [458:475]:
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    private <T> Map<String, T> copySafe(Map<?, ?> table, Class<T> valueType) {
        Map<String, T> map;
        if (table == null || table.isEmpty()) {
            map = new HashMap<>();
        } else {
            map = new HashMap<>((int) (table.size() / 0.75f) + 1);
            for (Map.Entry<?, ?> entry : table.entrySet()) {
                Object key = entry.getKey();
                if (key instanceof String) {
                    Object value = entry.getValue();
                    if (valueType.isInstance(value)) {
                        map.put(key.toString(), valueType.cast(value));
                    }
                }
            }
        }
        return map;
    }
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maven-resolver-impl/src/main/java/org/eclipse/aether/internal/impl/session/DefaultSessionBuilder.java [493:510]:
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    private static <T> Map<String, T> copySafe(Map<?, ?> table, Class<T> valueType) {
        Map<String, T> map;
        if (table == null || table.isEmpty()) {
            map = new HashMap<>();
        } else {
            map = new HashMap<>((int) (table.size() / 0.75f) + 1);
            for (Map.Entry<?, ?> entry : table.entrySet()) {
                Object key = entry.getKey();
                if (key instanceof String) {
                    Object value = entry.getValue();
                    if (valueType.isInstance(value)) {
                        map.put(key.toString(), valueType.cast(value));
                    }
                }
            }
        }
        return map;
    }
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