EqualsNullAnalyzer

Using = or <> to compare with null produces less optimal IL code.

Problem

let a = obj()
// Analyzer will trigger
a = null

isNull a

This analyzer has a code fix for Ionide:

code fix for EqualsNullAnalyzer

val a: obj

type obj = System.Object

val isNull: value: 'T -> bool (requires 'T: null)