Shouldn't construct_array_builtin and deconstruct_array_builtin agree on types?

Hi,

I noticed that these two function, introduced in d746021de18b, disagree
on what types they support. For construct_array_builtin, we support
these types:

 - CHAROID:
 - CSTRINGOID:
 - FLOAT4OID:
 - INT2OID:
 - INT4OID:
 - INT8OID:
 - NAMEOID:
 - OIDOID:
 - REGTYPEOID:
 - TEXTOID:
 - TIDOID:

while deconstruct_array_builtin supports just a subset:

 - CHAROID:
 - CSTRINGOID:
 - FLOAT8OID:
 - INT2OID:
 - OIDOID:
 - TEXTOID:
 - TIDOID:

I ran into this for INT4OID. Sure, I can just lookup the stuff and use
the regualr deconstruct_array, but the asymmetry seems a bit strange. Is
that intentional?

regards

-- 
Tomas Vondra
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