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What is the difference between SR.var() and var()?

Is this a bug?

If you type:

sage: SR.var('a')
a
sage: a?
Object `a` not found.

However, this works:

sage: var('a')
a
sage: a?
Type:           Expression
String form:    a
....

What is the difference between SR.var() and var()?

Is this a bug?

If you type:

sage: SR.var('a')
a
sage: a?
Object `a` not found.

However, this works:

sage: var('a')
a
sage: a?
Type:           Expression
String form:    a
....