alterColumn = true
			}
		}
	} else {
		if precision, _, ok := columnType.DecimalSize(); ok && int64(field.Precision) != precision {
			if regexp.MustCompile(fmt.Sprintf("[^0-9]%d[^0-9]", field.Precision)).MatchString(m.DataTypeOf(field)) {
				alterColumn = true
			}
		}
	}

	// check nullable
	if nullable, ok := columnType.Nullable(); ok && nullable == field.NotNull {

		{"net/http/internal-foo", true},
		{"net/http/internal", false},
		{"net/http/internal/bar", false},
		{"internal/foo", false},
		{"internal", false},
	}
	for _, tt := range tests {
		got := !internalPkg.MatchString(tt.pkg)
		if got != tt.want {
			t.Errorf("%s is internal = %v; want %v", tt.pkg, got, tt.want)
		}
	}
}

func BenchmarkAll(b *testing.B) {
	for i := 0; i < b.N; i++ {

			// - 'go list std' does not include commands, which cannot be
			//   imported anyway.
			if ip := pkg.ImportPath; pkg.Standard && ip != "unsafe" && !strings.HasPrefix(ip, "vendor/") && !internalPkg.MatchString(ip) {
				stdPackages = append(stdPackages, ip)
			}
			importDir[pkg.ImportPath] = pkg.Dir
			if len(pkg.ImportMap) > 0 {
				importMap[pkg.Dir] = make(map[string]string, len(pkg.ImportMap))
			}