fix: prevent negative slice index when last exceeds items count

pagination.go

@@ -64,6 +64,9 @@ func GetPage[T any](items []T, first *int, after *string, last *int, before *str
 	} else if last != nil {
 		tmp = *last
 		sIx = len(items) - tmp
+		if sIx < 0 {
+			sIx = 0
+		}
 		eIx = len(items)
 	}
 	if cursor, err := DecodeCursor(after); err == nil && cursor != "" {

pagination_test.go

@@ -116,6 +116,17 @@ func TestGetPage(t *testing.T) {
 				EndCursor:       ptr("MQ=="),
 			},
 		},
+		{
+			name:      "last exceeds items count",
+			args:      args[string]{items: []string{"1", "2", "3"}, last: ptr(10), max: 10, fn: func(s string) string { return s }},
+			wantItems: []string{"1", "2", "3"},
+			wantPageInfo: PageInfo{
+				StartCursor:     ptr("MQ=="),
+				HasNextPage:     false,
+				HasPreviousPage: false,
+				EndCursor:       ptr("Mw=="),
+			},
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {