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- Config values are not casted to strings (despite promised). - Config keys are not casted to strings (although promised, too). - XML can be invalid and not parse-able for many reasons. - Config keys are not validated/sanitized. - config()->clear() should really be ->unset(). - Configuration must not be additionally cached by a module in any way (static cache / database cache). - Some modules invoke drupal_alter() on configuration (e.g., image styles). - Need a way to list config object names/suffixes _after_ a specified prefix. - Need a way to determine whether a config object exists. - Some modules might have a valid use-case for retrieving/listing config objects using a wildcard within the name (instead of only searching by prefix). - The key of a retrieved value is unknown; since you only get the value. Configuration values (or sub-values) may be passed forward to another function/callback, and thus, that function no longer knows about the key of the value. (unless the key is contained in the value, which is a very very wonky duplication) - Config keys must not contain periods (within a specific key).
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