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Use more precise return type for MessageInterface::getHeaders #102

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Use more precise return type for MessageInterface::getHeaders #102

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2 changes: 1 addition & 1 deletion src/MessageInterface.php
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Original file line number Diff line number Diff line change
Expand Up @@ -61,7 +61,7 @@ public function withProtocolVersion($version);
* While header names are not case-sensitive, getHeaders() will preserve the
* exact case in which headers were originally specified.
*
* @return string[][] Returns an associative array of the message's headers. Each
* @return array<string, string[]> Returns an associative array of the message's headers. Each
* key MUST be a header name, and each value MUST be an array of strings
* for that header.
*/
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