OpenGL double type. Note that some of glTF 2.0 validator does not; support double type even the schema seems allow any value of integer: https://github.com/KhronosGroup/glTF/blob/b9884a2fd45130b4d673dd6c8a706ee21ee5c5f7/specification/2.0/schema/accessor.schema.json#L22
See Source File
OpenGL double type. Note that some of glTF 2.0 validator does not; support double type even the schema seems allow any value of integer: https://github.com/KhronosGroup/glTF/blob/b9884a2fd45130b4d673dd6c8a706ee21ee5c5f7/specification/2.0/schema/accessor.schema.json#L22