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Tcl 9 changed several API functions to take Tcl_Size, which is ptrdiff_t, instead of int, for 64-bit enablement. We have to change a few local variables to be compatible with that. We also provide a fallback typedef of Tcl_Size for older Tcl versions. The affected variables are used for quantities that will not approach values beyond the range of int, so this doesn't change any functionality. Reviewed-by: Tristan Partin <tristan@partin.io> Discussion: https://www.postgresql.org/message-id/flat/bce0fe54-75b4-438e-b42b-8e84bc7c0e9c%40eisentraut.org