Squiz/EmbeddedPhp doesn't examine code using short open echo tag

[jrfnl]

Repost from squizlabs/PHP_CodeSniffer#3705:

Given this code:

<?php   echo $var   ?>

Running the Squiz.PHP.EmbeddedPhp sniff over it results in:

-------------------------------------------------------------------------------------------------------------
FOUND 3 ERRORS AFFECTING 1 LINE
-------------------------------------------------------------------------------------------------------------
 1 | ERROR | [x] Expected 1 space after opening PHP tag; 3 found
   |       |     (Squiz.PHP.EmbeddedPhp.SpacingAfterOpen)
 1 | ERROR | [x] Inline PHP statement must end with a semicolon (Squiz.PHP.EmbeddedPhp.NoSemicolon)
 1 | ERROR | [x] Expected 1 space before closing PHP tag; 3 found
   |       |     (Squiz.PHP.EmbeddedPhp.SpacingBeforeClose)
-------------------------------------------------------------------------------------------------------------
PHPCBF CAN FIX THE 3 MARKED SNIFF VIOLATIONS AUTOMATICALLY
-------------------------------------------------------------------------------------------------------------

... while running the same sniff over the below code doesn't yield any errors:

<?=   $var   ?>

Questions

1. Should the T_OPEN_TAG_WITH_ECHO token be added to the sniff ?
2. If so and as the sniff would now start acting on more files, should the error codes for issues found in embedded PHP statements using short open echo tags be different ?

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