code: func (b *fixupBody) Content(schema *hcl.BodySchema) (*hcl.BodyContent, hcl.Diagnostics) {
  	schema = b.effectiveSchema(schema)
  	content, diags := b.original.Content(schema)
  	return b.fixupContent(content), diags
  }
docs: // Content decodes content from the body. The given schema must be the lower-level
  // representation of the same schema that was previously passed to FixUpBlockAttrs,
  // or else the result is undefined.