Repository: diegoholiveira/jsonlogic (go)
Issue: panic: interface conversion error when map have only number in string key 
Sample code to reproduce

```package main

import (
	"bytes"
	"fmt"
	"strings"

	"github.com/diegoholiveira/jsonlogic"
)

func main() {

	logic := strings.NewReader(`{"and":[{">":[{"*":[{"/":[{"var":"tradeItems.43443.quantity.REJECTED"},{"var":"tradeItems.43443.quantity.RECEIVED"}]},100]},0.1]}]}`)
	data := strings.NewReader(`{"tradeItems":{"43443":{"lineItemNo":1,"itemName":"Item16","SKUCode":"43443","HSNCode":"45455","quantity":{"ACCEPTED":4500,"APPROVED":0,"DESTRUCTED":0,"INTRANSIT":4500,"INVOICED":4500,"INVOICED_REMAINING":0,"INVOICE_APPROVED":0,"INVOICE_PAID":0,"INVOICE_REJECTED":0,"ORDERED":4500,"QC":4500,"QC_REMAINING":0,"READY_TO_SHIP":4500,"READY_TO_SHIP_REMAINING":0,"RECEIVED":4500,"REJECTED":0,"REQUESTED":0,"REQUESTED_REMAINING":0,"SCRAPPED":0},"supplier":{"orgId":"DESU1","orgName":"Supplier Org1","emailId":"","vendorCode":"","address":"Juhu Road","departmentId":""},"receiver":{"orgId":"DEOW1","orgName":"Buyer","emailId":"","vendorCode":"","address":"T-68-1","departmentId":""},"deliverBy":"2020-04-30T18:29:59Z","deliverByUnixTs":1588271399,"pricePerUnit":30,"qualityMeasure":"","reasonForRejection":"","taxApplicable":{"CGST":{"id":"","taxName":"CGST","taxRate":8,"taxAmount":10800,"isApplicable":true},"IGST":{"id":"","taxName":"","taxRate":0,"taxAmount":0,"isApplicable":false},"SGST":{"id":"","taxName":"SGST","taxRate":8,"taxAmount":10800,"isApplicable":true}},"items":[],"shopOrder":"","totalAmount":0}}}`)
	var result bytes.Buffer

	err := jsonlogic.Apply(logic, data, &result)

	fmt.Println(result.String())
	fmt.Println(err)
}


error :
 panic: interface conversion: interface {} is map[string]interface {}, not []interface {}

goroutine 1 [running]:
github.com/diegoholiveira/jsonlogic.getVar(0x154500, 0x40c178, 0x154e60, 0x43e3e0, 0x0, 0x154e60)
	/tmp/gopath790557694/pkg/mod/github.com/diegoholiveira/jsonlogic@v2.3.1+incompatible/vars.go:89 +0x740
github.com/diegoholiveira/jsonlogic.operation(0x40e053, 0x3, 0x154500, 0x40c178, 0x154e60, 0x43e3e0, 0x132500, 0x1c8f)
	/tmp/gopath790557694/pkg/mod/github.com/diegoholiveira/jsonlogic@v2.3.1+incompatible/jsonlogic.go:540 +0x1120
github.com/diegoholiveira/jsonlogic.apply(0x154e60, 0x43e3a0, 0x154e60, 0x43e3e0, 0x277801, 0x15d240)
	/tmp/gopath790557694/pkg/mod/github.com/diegoholiveira/jsonlogic@v2.3.1+incompatible/jsonlogic.go:708 +0x1e0
github.com/diegoholiveira/jsonlogic.parseValues(0x14d940, 0x40a0f0, 0x154e60, 0x43e3e0, 0x0, 0x1c00)
	/tmp/gopath790557694/pkg/mod/github.com/diegoholiveira/jsonlogic@v2.3.1+incompatible/jsonlogic.go:674 +0x260
github.com/diegoholiveira/jsonlogic.apply(0x154e60, 0x43e380, 0x154e60, 0x43e3e0, 0x277801, 0x16e9a7)
	/tmp/gopath790557694/pkg/mod/github.com/diegoholiveira/jsonlogic@v2.3.1+incompatible/jsonlogic.go:708 +0x1a0
github.com/diegoholiveira/jsonlogic.parseValues(0x14d940, 0x40a110, 0x154e60, 0x43e3e0, 0xfefc9a08, 0x0)
	/tmp/gopath790557694/pkg/mod/github.com/diegoholiveira/jsonlogic@v2.3.1+incompatible/jsonlogic.go:674 +0x260
github.com/diegoholiveira/jsonlogic.apply(0x154e60, 0x43e360, 0x154e60, 0x43e3e0, 0x277801, 0x8)
	/tmp/gopath790557694/pkg/mod/github.com/diegoholiveira/jsonlogic@v2.3.1+incompatible/jsonlogic.go:708 +0x1a0
github.com/diegoholiveira/jsonlogic.parseValues(0x14d940, 0x40a130, 0x154e60, 0x43e3e0, 0x40e0a0, 0x1010000)
	/tmp/gopath790557694/pkg/mod/github.com/diegoholiveira/jsonlogic@v2.3.1+incompatible/jsonlogic.go:674 +0x260
github.com/diegoholiveira/jsonlogic.apply(0x154e60, 0x43e340, 0x154e60, 0x43e3e0, 0x277801, 0x1c8f)
	/tmp/gopath790557694/pkg/mod/github.com/diegoholiveira/jsonlogic@v2.3.1+incompatible/jsonlogic.go:708 +0x1a0
github.com/diegoholiveira/jsonlogic.parseValues(0x14d940, 0x40a140, 0x154e60, 0x43e3e0, 0x16, 0x1c8f)
	/tmp/gopath790557694/pkg/mod/github.com/diegoholiveira/jsonlogic@v2.3.1+incompatible/jsonlogic.go:674 +0x260
github.com/diegoholiveira/jsonlogic.apply(0x154e60, 0x43e320, 0x154e60, 0x43e3e0, 0x1, 0x0)
	/tmp/gopath790557694/pkg/mod/github.com/diegoholiveira/jsonlogic@v2.3.1+incompatible/jsonlogic.go:708 +0x1a0
github.com/diegoholiveira/jsonlogic.Apply(0x1c0300, 0x43e2c0, 0x1c0300, 0x43e2e0, 0x1c0140, 0x43e300, 0x1, 0x4)
	/tmp/gopath790557694/pkg/mod/github.com/diegoholiveira/jsonlogic@v2.3.1+incompatible/jsonlogic.go:736 +0x220
main.main()
	/tmp/sandbox395415131/prog.go:17 +0x140
Pull request description: Fix access to properties using numeric keys
Closes #29 

Patch:
diff --git a/vars.go b/vars.go
index a05028a..5793091 100644
--- a/vars.go
+++ b/vars.go
@@ -85,12 +85,14 @@ func getVar(value, data interface{}) interface{} {
 			continue
 		}
 
-		if toNumber(part) > 0 {
-			_value = data.([]interface{})[int(toNumber(part))]
-		} else {
+		if isMap(data) {
 			_value = data.(map[string]interface{})[part]
 		}
 
+		if isSlice(data) {
+			_value = data.([]interface{})[int(toNumber(part))]
+		}
+
 		if _value == nil {
 			return _default
 		}


Test patch:
diff --git a/jsonlogic_test.go b/jsonlogic_test.go
index 1d4a644..395dd77 100644
--- a/jsonlogic_test.go
+++ b/jsonlogic_test.go
@@ -478,3 +478,47 @@ func TestZeroDivision(t *testing.T) {
 
 	assert.JSONEq(t, `0`, result.String())
 }
+
+func TestSliceWithOnlyWithNumbersAsKey(t *testing.T) {
+	rule := strings.NewReader(`{"var": "people.0"}`)
+
+	data := strings.NewReader(`{
+		"people": [
+			{"age":18, "name":"John"},
+			{"age":20, "name":"Luke"},
+			{"age":18, "name":"Mark"}
+		]
+	}`)
+
+	var result bytes.Buffer
+	err := Apply(rule, data, &result)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	expected := `{"age": 18, "name": "John"}`
+
+	assert.JSONEq(t, expected, result.String())
+}
+
+func TestMapWithOnlyWithNumbersAsKey(t *testing.T) {
+	rule := strings.NewReader(`{"var": "people.103"}`)
+
+	data := strings.NewReader(`{
+		"people": {
+			"100": {"age":18, "name":"John"},
+			"101": {"age":20, "name":"Luke"},
+			"103": {"age":18, "name":"Mark"}
+		}
+	}`)
+
+	var result bytes.Buffer
+	err := Apply(rule, data, &result)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	expected := `{"age": 18, "name": "Mark"}`
+
+	assert.JSONEq(t, expected, result.String())
+}