Get implemented on T instead of *T

Methods defined on T are also available on *T. Thought this technically
changes the interface, because *T will be automatically dereferenced as
needed it shouldn't be a breaking change.

See a8802b16cc for similar change.

float8_array.go

@@ -64,7 +64,7 @@ func (dst *Float8Array) Set(src interface{}) error {
 	return nil
 }
 
-func (dst *Float8Array) Get() interface{} {
+func (dst Float8Array) Get() interface{} {
 	switch dst.Status {
 	case Present:
 		return dst