I have found the following behaviour:

sage: A=AffineSpace(QQ,1)
sage: B=ProjectiveSpace(QQ,2)
sage: h1=A.hom([x,0,1],B)
sage: h2=A.hom([1,0,x],B)
sage: S=h1.glue_along_domains(h2)
sage: S
Scheme obtained by gluing X and Y along U, where
  X: Projective Space of dimension 2 over Rational Field
  Y: Projective Space of dimension 2 over Rational Field
  U: Affine Space of dimension 1 over Rational Field
sage: S.base_scheme()
Spectrum of Integer Ring
sage: S.base_ring()
Integer Ring


Isn't the result supposed to be over the rationals? Or am i missing
something?

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