No need to explain the gloss. That is not the purpose of the note field.

@@ -19 +19 @@
-<s_inf>after the -masu stem of a verb; indicates possibility of an action</s_inf>
+<s_inf>after the -masu stem of a verb</s_inf>

Is this... an ARGUMENT?! IMPOSSIBLE!!!!
Anyhow, a little redundancy to make sure something sticks has never hurt a dam, but I can see your point.

"indicates possibility of an action" adds nothing but fluff considering the glosses relay the same semantic information.

daijs, daijr, meikyo

Adding notes with the intent of further clarifying function.

Changing both senses to v2a-s.
Addressing the points in 2020-09-01 20:16:58, This is considered by every Japanese source I have looked at as the only remaining 二段 verb in modern Japanese and it does conjugate, even if the only provable instances of conjugation are the identical 連体形 and 終止形, both forms are still formally distinguished by 国語 grammars by their use much like english tells apart past 'read' from non-past 'read' by pronunciation. Non-provable instances of conjugation would be 未然形 and 連用形 as they would be completely indiscernible from える. Finally, there is the provable case of the 仮定形, but it is almost never used: ありうれば returns measly 33 results from the N-gram and a google search only 407 - though you will see that it is indeed the 仮定形 if you stop to read some of phrases found by google.

@@ -17 +17 @@
-<pos>&v-unspec;</pos>
+<pos>&v2a-s;</pos>
@@ -19 +19 @@
-<s_inf>after the -masu stem of a verb</s_inf>
+<s_inf>after the -masu stem of a verb; indicates possibility of an action</s_inf>
@@ -24 +24 @@
-<pos>&v-unspec;</pos>
+<pos>&v2a-s;</pos>

It's our only "v-unspec". We can look at it again if needed.